tools: remove specific case for FreeBSD in cmd/tools/vtest_test.v (#24707)

Author: lcheylus

cmd/tools/vtest_test.v

@@ -13,11 +13,7 @@ fn testsuite_end() {
 }
 
 fn testsuite_begin() {
-	$if freebsd {
-		os.setenv('VFLAGS', '-cc clang', true)
-	} $else {
-		os.setenv('VFLAGS', '', true)
-	}
+	os.setenv('VFLAGS', '', true)
 	os.setenv('VCOLORS', 'never', true)
 	os.setenv('VJOBS', '2', true)
 	os.rmdir_all(tpath) or {}