Rename EXTERN_C Macros that have reserved names#4
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… interferes with Standard Library headers in MSVC
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Use of the Macro _END_EXTERN_C interferes with Standard Library headers in MSVC. This PR renames _END_EXTERN_C and _BEGIN_EXTERN_C so they do not have reserved names starting with an underscore and Uppercase letter.
The use of _END_EXTERN_C was causing me trouble when getopt,h was included between 2 different standard library includes. The standard library headers had defined it before getopt.h was included, and getopt.h undefines it causing the following standard library includes to fail.
I didn't rename any of the other Macros that have reseved names starting with an underscore as they didn't seem like they would cause trouble.