[Makefile.am] Clean up CFLAGS handling, don't override all: target
[Makefile.am] Clean up CFLAGS handling, don't override all: target

First, we should move the CFLAGS into AM_CFLAGS, otherwise the
per-target CFLAGS forces Automake to prefix object files, which
is unnecessary since we only have one target.

More importantly, avoid overriding the all: target here; that's
owned by Automake.  Use all-local instead to append things to
the end of the normal build.

davibe/pygobject,thiblahute/pygobject,GNOME/pygobject,choeger/pygobject-cmake,nzjrs/pygobject,davidmalcolm/pygobject,sfeltman/pygobject,pexip/pygobject,davibe/pygobject,GNOME/pygobject,Distrotech/pygobject,MathieuDuponchelle/pygobject,jdahlin/pygobject,alexef/pygobject,sfeltman/pygobject,thiblahute/pygobject,MathieuDuponchelle/pygobject,davidmalcolm/pygobject,sfeltman/pygobject,nzjrs/pygobject,Distrotech/pygobject,davibe/pygobject,davidmalcolm/pygobject,davibe/pygobject,pexip/pygobject,MathieuDuponchelle/pygobject,choeger/pygobject-cmake,jdahlin/pygobject,nzjrs/pygobject,thiblahute/pygobject,Distrotech/pygobject,GNOME/pygobject,pexip/pygobject,alexef/pygobject,jdahlin/pygobject,alexef/pygobject,choeger/pygobject-cmake,Distrotech/pygobject