For some reason they were different (100/120), which made some tests
produce different output when I moved from showSDoc to printDoc for
error messages.

Unconditionally add .exe to the output executable name when using
--make on Windows, and no -o option was given.

This is all a bit of a mess, but can hopefully be improved when we get
encoding/decoding support in Handles.

we'll create it anyway

This fixes trac #2266.

-fglasgow-exts also turns it on.

We no longer create those directories

If it has been built then we pass it, even if we are still using the
bootstrapping compiler.

These are needed for GLOBAL_VAR's to work properly

It's probably to work around a long-dead bug

...which is good, as the conditional test was broken anyway!