Avoid compilation errors in MinGW native builds of GDB
The error is triggered by including python-internal.h, and the error message is: In file included from d:\usr\lib\gcc\mingw32\6.3.0\include\c++\math.h:36:0, from build-gnulib/import/math.h:27, from d:/usr/Python26/include/pyport.h:235, from d:/usr/Python26/include/Python.h:58, from python/python-internal.h:94, from python/py-arch.c:24: d:\usr\lib\gcc\mingw32\6.3.0\include\c++\cmath:1157:11: error: '::hypot' has not been declared using ::hypot; ^~~~~ This happens because Python headers define 'hypot' to expand to '_hypot' in the Windows builds. gdb/ChangeLog: 2018-01-27 Eli Zaretskii <email@example.com> * python/python-internal.h (_hypot) [__MINGW32__]: Define back to 'hypoth'. This avoids a compilation error.
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