make: no more duality for 15.7 needed

Switch off warnings by default, we just did enable them in master
by default.

Makefile

@@ -17,9 +17,6 @@ install: force
 	# move all sources to their destination
 	@mkdir -p ${DESTDIR}/usr/local
 	@cp -r ${.CURDIR}/src/* ${DESTDIR}/usr/local
-	# disable warnings for production systems
-	@sed -i '' -e 's/E_STRICT/E_STRICT | E_WARNING/g' \
-	    ${DESTDIR}/usr/local/etc/rc.php_ini_setup
 	# invoke pkg(8) bootstraping
 	@make -C ${.CURDIR}/pkg install
 	# invoke translation glue

src/etc/rc.php_ini_setup

@@ -107,7 +107,7 @@ zlib.output_compression = Off
 zlib.output_compression_level = 1
 include_path = ".:/usr/local/etc/inc:/usr/local/www:/usr/local/opnsense/mvc:/usr/local/share/pear:/usr/local/opnsense/contrib"
 ignore_repeated_errors = on
-error_reporting = E_ALL ^ (E_NOTICE | E_DEPRECATED | E_STRICT)
+error_reporting = E_ALL ^ (E_NOTICE | E_DEPRECATED | E_STRICT | E_WARNING)
 display_errors=on
 log_errors=on
 error_log=/tmp/PHP_errors.log