rsa.c: fix incorrect guard for pvk-* options

This update syncs the #if guard protecting the pvk-* options
with the rest of the source handling those options. Also fix
some nearby whitespace.
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1365)