This is partial work towards including Typescript types for pyproxy.js. Typescript does not understand assignments to `Module`, it wants information to be communicated via `import` and `export`. Therefore, the public functions from `pyproxy.js` that we want type annotations for need to be exported using the `export` keyword. This necessitates switching to importing pyproxy.js via rollup.

There are two commits here, in the first commit I made the manual changes needed preserving indentation in pyproxy.js, and in the second commit I applied the linter to pyproxy.js. Almost every line in pyproxy.js has a change in indentation. These indentation changes are my main motivation for making this into a separate PR.

Currently I apply the macro preprocessor to pyproxy.js with 
```sh
cat $< | $(CC) -E -C -P -imacros src/core/pyproxy.c -o $@ $(MAIN_MODULE_CFLAGS) -
```
As far as I can tell the effect of this is close to identical to what was happening before. In the future, we may consider rearranging things to avoid the need for preprocessing `pyproxy.js` -- it is unusual and has the potential to confuse people.
MAINT Use rollup instead of EM_JS to include pyproxy.js . This is partial work towards including Typescript types for pyproxy.js. Typescript does not understand assignments to `Module`, it wants information to be communicated via `import` and `export`. Therefore, the public functions from `pyproxy.js` that we want type annotations for need to be exported using the `export` keyword. This necessitates switching to importing pyproxy.js via rollup.

There are two commits here, in the first commit I made the manual changes needed preserving indentation in pyproxy.js, and in the second commit I applied the linter to pyproxy.js. Almost every line in pyproxy.js has a change in indentation. These indentation changes are my main motivation for making this into a separate PR.

Currently I apply the macro preprocessor to pyproxy.js with 
```sh
cat $< | $(CC) -E -C -P -imacros src/core/pyproxy.c -o $@ $(MAIN_MODULE_CFLAGS) -
```
As far as I can tell the effect of this is close to identical to what was happening before. In the future, we may consider rearranging things to avoid the need for preprocessing `pyproxy.js` -- it is unusual and has the potential to confuse people.
From 2b49ba503a0fd0be14e71ea831c06503b543ecb0 Mon Sep 17 00:00:00 2001
From: Sam Clegg <sbc@chromium.org>
Date: Mon, 12 Apr 2021 09:27:04 -0700
Subject: [PATCH] Update upstream URL for libjpeg. NFC (#13869)

The old URL seems to be generating `Forbidden!`.

I wonder if we should start maintaining our own mirror to avoid
this kind of thing.
---
 tools/ports/libjpeg.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/emsdk/upstream/emscripten/tools/ports/libjpeg.py b/emsdk/upstream/emscripten/tools/ports/libjpeg.py
index f0deb7f4a7d..563ef7fd09f 100644
--- a/emsdk/upstream/emscripten/tools/ports/libjpeg.py
+++ b/emsdk/upstream/emscripten/tools/ports/libjpeg.py
@@ -8,7 +8,7 @@
 import logging
 
 VERSION = '9c'
-HASH = '2b581c60ae401a79bbbe748ff2deeda5acd50bfd2ea22e5926e36d34b9ebcffb6580b0ff48e972c1441583e30e21e1ea821ca0423f9c67ce08a31dffabdbe6b7'
+HASH = 'b2affe9a1688bd49fc033f4682c4a242d4ee612f1affaef532f5adcb4602efc4433c4a52a4b3d69e7440ff1f6413b1b041b419bc90efd6d697999961a9a6afb7'
 
 
 def needed(settings):
@@ -16,7 +16,7 @@ def needed(settings):
 
 
 def get(ports, settings, shared):
-  ports.fetch_project('libjpeg', 'https://dl.bintray.com/homebrew/mirror/jpeg-9c.tar.gz', 'jpeg-9c', sha512hash=HASH)
+  ports.fetch_project('libjpeg', 'https://storage.googleapis.com/webassembly/emscripten-ports/jpegsrc.v9c.tar.gz', 'jpeg-9c', sha512hash=HASH)
 
   def create(final):
     logging.info('building port: libjpeg')

From 2b49ba503a0fd0be14e71ea831c06503b543ecb0 Mon Sep 17 00:00:00 2001
From: Sam Clegg <sbc@chromium.org>
Date: Mon, 12 Apr 2021 09:27:04 -0700
Subject: [PATCH] Update upstream URL for libjpeg. NFC (#13869)

The old URL seems to be generating `Forbidden!`.

I wonder if we should start maintaining our own mirror to avoid
this kind of thing.
---
 tools/ports/libjpeg.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/emsdk/upstream/emscripten/tools/ports/libjpeg.py b/emsdk/upstream/emscripten/tools/ports/libjpeg.py
index f0deb7f4a7d..563ef7fd09f 100644
--- a/emsdk/upstream/emscripten/tools/ports/libjpeg.py
+++ b/emsdk/upstream/emscripten/tools/ports/libjpeg.py
@@ -8,7 +8,7 @@
 import logging
 
 VERSION = '9c'
-HASH = '2b581c60ae401a79bbbe748ff2deeda5acd50bfd2ea22e5926e36d34b9ebcffb6580b0ff48e972c1441583e30e21e1ea821ca0423f9c67ce08a31dffabdbe6b7'
+HASH = 'b2affe9a1688bd49fc033f4682c4a242d4ee612f1affaef532f5adcb4602efc4433c4a52a4b3d69e7440ff1f6413b1b041b419bc90efd6d697999961a9a6afb7'
 
 
 def needed(settings):
@@ -16,7 +16,7 @@ def needed(settings):
 
 
 def get(ports, settings, shared):
-  ports.fetch_project('libjpeg', 'https://dl.bintray.com/homebrew/mirror/jpeg-9c.tar.gz', 'jpeg-9c', sha512hash=HASH)
+  ports.fetch_project('libjpeg', 'https://storage.googleapis.com/webassembly/emscripten-ports/jpegsrc.v9c.tar.gz', 'jpeg-9c', sha512hash=HASH)
 
   def create(final):
     logging.info('building port: libjpeg')
