Re-organize a bunch of CFLAGS-related makefile bits

Some of our makefile bits are a mess, as you may have noticed, making
changes to them difficult to review.

This patch attempts to make some parts of them vaguely less of a mess,
in order to facilitate review of follow-up changes.  To so it:

- coalesces feature flags, optimizations, -W{no-,}, -W{no-}error,
  include directives, and define/undefine directives into (mostly)
  separate groups.
- exports them as appropriate so the sub-makes can use them
- Makes sure we have -Wextra -Werror everywhere, but adds -Wno-foo and
  -Wno-error=foo directives at the appropriate places to keep the net
  warnings the same.
- makes the arch defines in Cryptlib and Cryptlib/OpenSSL use the
  appropriate ones, with no attempt to make them less stupid, without
  changing the overall order.
- coalesces the various includes, with no attempt to make them less
  stupid, without changing the overall order.
- One giant glaring whitespace fix in Cryptlib/OpenSSL/Makefile

Signed-off-by: Peter Jones <pjones@redhat.com>

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