added perl6_ops.c and compile it to dll

This pulls in nqp::backendconfig to get build flags to build it.
One fix needed for Win32 extops build.
More Win32 extops build fixes.
More fixes for Windows build.

This seems to unregress stuff.
Correct Makefile to not just build extops.
Try adding ext-op; comment out what won't link.
Merge branch 'config' into moar-support

Conflicts:
	ConfigureMoar.pl
	tools/build/Makefile-Moar.in