(trunk, libT) #5476: also, define __USE_MINGW_ANSI_STDIO and __STDC_FORMAT_MACROS on win32 systems so these new macros will work on mingw-w64 and mingw. (rb07)

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14184 f4695dd4-2c0a-0410-b89c-da849a56a58e