Use a JIT-specific stdout `FILE*`.

Use a JIT-specific stdout `FILE*`.

Historically, the JIT has had issues with logging inside of processes
that change the output mode of stdout (e.g. crossgen). This change
replaces the previous solution (which relied on #ifdefs) by dup'ing
the stdout file and wrapping it in a new `FILE*` set to a known
output mode.

Commit migrated from https://github.com/dotnet/coreclr/commit/8172ccaa93df60a46712f3453a4871ce0026f3ea