scannerparser.y: Really remove temp .h file on Windows

In gi_source_scanner_parse_macros(), a temporary .h file is generated
during the process of parsing the macros, and they aren't being deleted
on Windows.  In turns out that the g_unlink() call in that function failed
because Windows does not allow one to unlink/delete files while they are
open, and that the g_unlink() call is done way early (for some reason).

Fix this by calling fclose() on the fmacros FILE* *after* we are done
with fmacros, and then finally call g_unlink() on the temp .h file.

https://bugzilla.gnome.org/show_bug.cgi?id=781525

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