Ben Gamari authored Nov 05, 2019 and Marge Bot committed Nov 07, 2019

In general this is the convention that we use in the RTS. On Windows
things actually fail if we break it. For instance, you see things like:

   includes\stg\Types.h:26:9: error:
     warning: #warning "Mismatch between __USE_MINGW_ANSI_STDIO
     definitions. If using Rts.h make sure it is the first header
     included." [-Wcpp]