make: use -Wextra (minus some obnoxious bits)

gcc -Wextra, has a lot of good, useful checks, a few obnoxious checks,
and a few absolutely insane checks.

This enables -Wextra, but disables -Wmissing-field-initializers, because
it is irrational nonsense that just leads to worse code.  It also
disables some specific things in the Cryptlib and Cryptlib/OpenSSL
trees:

Both:
-Wno-unused-parameter
 - there are a fair number of functions that have to conform to some API
   or another but have arguments that are unused, but haven't been
   marked with UNUSED; we don't need to see warnings about them.

Cryptlib/OpenSSL:
-Wno-empty-body
 - functions that exist merely to populate some API
-Wno-implicit-fallthrough
 - these probably should get fixed someday, but I bet upstream will do
   it and rebasing will solve it
-Wno-old-style-declaration
 - this gripes if you write "const static" instead of "static const".
   Again I expect rebasing will fix it at some point.
-Wno-unused-but-set-variable
 - self explanatory, and again, I expect a rebase to solve it someday.

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

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