This reverts commit 875c9a28.
because it doesn't make sense to build the dmake modules
without -fsigned-char and the gbuild modules with -fsigned-char

and we're still got a few bugs where we assume chars are signed

Conflicts:

	solenv/inc/unxlngppc.mk

Change-Id: I6ac07fa3ebadd83efd0da1ee69a010b62dfaad59