64-bit Windows fixes: use size_t to write options file; only link _startup3.o...

64-bit Windows fixes: use size_t to write options file; only link _startup3.o and _startup4.o on 64-bit Windows
1 job for 2-64-bit-windows-version in 1 minute and 14 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #109607
linux

00:01:14