Create allow-php.inc

We have PHP items blacklisted in disable-interpreters.inc that never get noblacklisted. This PR fixes that.

Author: glitsj16

etc/allow-php.inc

@@ -0,0 +1,7 @@
+# This file is overwritten during software install.
+# Persistent customizations should go in a .local file.
+include allow-php.local
+
+noblacklist ${PATH}/php*
+noblacklist /usr/lib/php*
+noblacklist /usr/share/php*