in bsd.default-versions.mk later, and the value from the Makefile will
not be used at all. We would change bsd.default-versions.mk, but really
these ports should not be changing what the "default" it. Change to
modifying what the "current" version is as PHP_VER.
This fixes some cases of 'make check-sanity' not passing for php extension
ports in Poudriere where there is no LOCALBASE/etc/php.conf to set a proper
PHP_VER. In these cases the PHP_DEFAULT value (of 5.6) is used rather than
the version set by the extension Makefile and the later checks for
whether that version has that extension may incorrectly error.
