www/mod_php8*: Fix build

USES=apache must be called before bsd.pre.port.mk however this was
overridden using an include clause. During my previous commit on
refactoring apache.mk these include blocks were deleted which causes
failure to the build of these port as USES=apache in preport.mk is never
called. This commit changes and refactors the code.

Fixes: 40843b1 Mk/Uses/apache.mk: Refactor after removal of older versions