Add DISABLE_MKSTEMP_DEFINE support
This macro as written won't compile on mingw32 due to the attributes on _mktemp(). This could be worked around, but it's easier to just disable it since I don't need it, and nobody else is building with mingw32.
This macro as written won't compile on mingw32 due to the attributes on _mktemp(). This could be worked around, but it's easier to just disable it since I don't need it, and nobody else is building with mingw32.