add a configure option to suppress uncritical warns with clang

Author: weltling

win32/build/config.w32

@@ -239,3 +239,10 @@ if (PHP_ANALYZER == "vs") {
 	PHP_ANALYZER = "no"
 }
 
+if (CLANG_TOOLSET) {
+	ARG_WITH("uncritical-warn-choke", "Disable some uncritical warnings", "yes");
+	if (PHP_UNCRITICAL_WARN_CHOKE != "no") {
+		ADD_FLAG("CFLAGS", "-Wno-ignored-attributes -Wno-deprecated-declarations -Wno-missing-braces -Wno-msvc-include -Wno-invalid-source-encoding");
+	}
+}
+