In is_make_type() never fall through for dmake

dmake -v is actually just verbose mode so it actually runs the
equivalent of 'dmake -f Makefile all'

Spotted by Steve Hay
Never fall through for nmake either

This saves a bazillion processes and processes are expensive on
Windows.
Release engineering for v7.03_03
[PATCH] Do not use ccstdflags with the core extensions.

Signed-off-by: Chris 'BinGOs' Williams <chris@bingosnet.co.uk>
Release engineering for v7.03_04