[ox/std] Add gcc library as dependency when building with GCC

deps/ox/src/ox/std/CMakeLists.txt

@@ -1,6 +1,5 @@
 add_library(
 	OxStd
-		arith.cpp
 		assert.cpp
 		buildinfo.cpp
 		byteswap.cpp
@@ -19,6 +18,11 @@ set_property(
 		POSITION_INDEPENDENT_CODE ON
 )
 
+target_link_libraries(
+	OxStd PUBLIC
+		$<$<CXX_COMPILER_ID:GNU>:gcc>
+)
+
 install(
 	FILES
 		assert.hpp

deps/ox/src/ox/std/arith.cpp

@@ -1,44 +0,0 @@
-/*
- * Copyright 2015 - 2018 gtalent2@gmail.com
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- */
-
-#include "hardware.hpp"
-
-// these provide software implementations of arithmetic operators expected by
-// the compiler on older processors
-
-#if !OX_HW_DIV
-
-extern "C" {
-
-unsigned __aeabi_uldivmod(unsigned, unsigned) {
-	return 0;
-}
-
-unsigned __aeabi_uidiv(unsigned, unsigned) {
-	return 0;
-}
-
-unsigned __aeabi_uimod(unsigned, unsigned) {
-	return 0;
-}
-
-unsigned __aeabi_uidivmod(unsigned, unsigned) {
-	return 0;
-}
-
-signed __aeabi_idiv(signed, signed) {
-	return 0;
-}
-
-signed __aeabi_imod(signed, signed) {
-	return 0;
-}
-
-}
-
-#endif