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