headers: make --enable-secure-api's description more exact.
winpthread: include windows.h before misc.h
stdio: Port vfscanf from ARM to Thumb
stdio: Port vfwscanf from ARM to Thumb
stdio: Port vsscanf from ARM to Thumb
stdio: Port vswscanf from ARM to Thumb
mingw-w64-headers: Adjust some inline functions for ARM
softmath: Include errno.h in internal header
winsdkver.h: Added new header.
Unify DATA only symbols imported from msvcr*
Add hypot and atan2 to libmingwex for x86 and x64.
Mark some math functions in 64-bit as DATA, and remove DATA for asin, acos, atan
Replace acos/asin/atan DATA attribute, as we don't provide own implementation for them right now.
We don't have tan implementation, therefore we need stub-code into msvcrt ...
Add special-case if one argument is INF, return INF.
Add special-case if one argument is NAN, and the other not INF, return NAN.
Override _cabs in libmingwex to make sure it uses C99 compliant cabs.
Reflect local override of _cabs in def-files by making import DATA only.