Makefile: Compose $(CFLAGS.a) with $(CFLAGS) instead of combine

Instead of defining a toplevel $(CFLAGS.a) that includes everything from
$(CFLAGS) plus whatever is statically defined in the Makefile, we now
use both $(CFLAGS) and $(CFLAGS.a) together, and we define neither.  Now
one can keep a single usage of $(CFLAGS), and override $(CFLAGS.a) when
desired.

Where previously, in order to give a flag only to $(CFLAGS.a), one had
to write:

    $ make CFLAGS.a="$CFLAGS --.a-only"

Now can be done via:

    $ make CFLAGS.a="--.a-only"

IOW, previously $(CFLAGS.so) was "everything you gave to $(CFLAGS), plus
this extra -fPIC" what now is "override $(CFLAGS), $(CFLAGS.a) or
$(CFLAGS.so) as you wish".

The same is true for $(LDLIBS), $(LDLIBS.a) and $(LDLIBS.so).

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