Closes https://github.com/pyodide/pyodide/issues/604

This creates an installable `pyodide-build` Python package that we can also upload to PyPi under https://pypi.org/project/pyodide-build/ (currently uploaded the dev version to reserve the name).

There is also the identically named `pyodide-build` CLI command which replaces `bin/pyodide`.

The short term goals is to use fewer hacks with `PATH` and `PYTHONPATH`. Long term goal make it a user facing interface for building packages instead of the Makefile.
Create an installable pyodide-build package. Closes https://github.com/pyodide/pyodide/issues/604

This creates an installable `pyodide-build` Python package that we can also upload to PyPi under https://pypi.org/project/pyodide-build/ (currently uploaded the dev version to reserve the name).

There is also the identically named `pyodide-build` CLI command which replaces `bin/pyodide`.

The short term goals is to use fewer hacks with `PATH` and `PYTHONPATH`. Long term goal make it a user facing interface for building packages instead of the Makefile.
Add a missing extern in specfunc_wrappers.c

--- a/scipy/special/specfun_wrappers.c
+++ b/scipy/special/specfun_wrappers.c
@@ -35,6 +35,7 @@
 extern void F_FUNC(itairy,ITAIRY)(double*,double*,double*,double*,double*);
 extern void F_FUNC(e1xb,E1XB)(double*,double*);
 extern void F_FUNC(e1z,E1Z)(npy_cdouble*,npy_cdouble*);
+extern void F_FUNC(eixz,EIXZ)(npy_cdouble*,npy_cdouble*);
 extern void F_FUNC(eix,EIX)(double*,double*);
 extern void F_FUNC(cerror,CERROR)(npy_cdouble*,npy_cdouble*);
 extern void F_FUNC(stvh0,STVH0)(double*,double*);

Add a missing extern in specfunc_wrappers.c

--- a/scipy/special/specfun_wrappers.c
+++ b/scipy/special/specfun_wrappers.c
@@ -35,6 +35,7 @@
 extern void F_FUNC(itairy,ITAIRY)(double*,double*,double*,double*,double*);
 extern void F_FUNC(e1xb,E1XB)(double*,double*);
 extern void F_FUNC(e1z,E1Z)(npy_cdouble*,npy_cdouble*);
+extern void F_FUNC(eixz,EIXZ)(npy_cdouble*,npy_cdouble*);
 extern void F_FUNC(eix,EIX)(double*,double*);
 extern void F_FUNC(cerror,CERROR)(npy_cdouble*,npy_cdouble*);
 extern void F_FUNC(stvh0,STVH0)(double*,double*);
