As things stood, buildfarm member dory failed.  MSVC versions lacking
stdint.h are unusable for building PostgreSQL, but pg_config.h.win32
doesn't know that.  Even so, we support other systems lacking stdint.h,
including buildfarm member gaur.  Per a suggestion from Tom Lane.

Discussion: https://postgr.es/m/9598.1550353336@sss.pgh.pa.us