[issue4805] Make python code compilable with a C++ compiler

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

A related question discussed on python-dev is whether extern "C" {} 
wrappers should ever be used in .c files.  I argue that the answer is "no" 
even if C++ compilability is desired.

The new patch eliminates several uses of extern "C" {} in .c files while 
preserving C++ compilability.  This is achieved by including proper header 
files instead of declaring external functions in .c files and in some 
cases adding declarations of functions that are used outside of the files 
they are defined in in the appropriate header files.

Added file: http://bugs.python.org/file12530/c++-patch-1.diff

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