[issue3754] cross-compilation support for python build

[Roumen Petrov]

Roumen Petrov added the comment:

I hope that  following separate issues will address remaining part of this patch:

required:
- 15483: initialise include and library paths in setup.py
- 15484: use _PYTHON_PROJECT_BASE in distutils sysconfig
- TODO: typo in in configure.in - use ac_cv_pthread instead ac_cv_thread
- 15268: skip "curses configure checks fail if only /usr/include/ncursesw/curses.h is installed"

optional:
- 15298: _sysconfigdata is generated in srcdir, not builddir
- 14598: _cursesmodule.c fails with ncurses-5.9 on Linux reported first as 14438 - _cursesmodule build fails on cygwin
and all other that allow python to be build smoothly outside source directory

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components: +Cross-Build -Build, Distutils2

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<http://bugs.python.org/issue3754>
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