[CI] No need to brew link php if we're not using an old version

tests/runci/targets/Php.hx

@@ -59,7 +59,6 @@ class Php {
 				Linux.requireAptPackages(["php-cli", "php-mbstring", "php-sqlite3"]);
 			case "Mac":
 				runNetworkCommand("brew", ["install", "php"]);
-				runCommand("brew", ["link", "--overwrite", "--force", "php"]);
 			case "Windows":
 				runNetworkCommand("cinst", ["php", "-version", "7.1.8", "-y"]);
 			case _: