[ox] Fix GBA compile errors

deps/ox/src/ox/std/error.hpp

@@ -18,6 +18,7 @@
 #define OxError(x) static_cast<ox::Error>(x)
 #endif
 
+#define oxIgnoreError(x)
 #define oxReturnError(x) if (const auto _err = ox::error::toError(x)) return _err
 
 namespace ox {

deps/ox/src/ox/std/memops.hpp

@@ -13,7 +13,7 @@
 #if __has_include(<cstring>)
 #include<cstring>
 #else
-void *memcpy(void *dest, const void *src, std::size_t size);
+extern "C" void *memcpy(void *dest, const void *src, std::size_t size);
 #endif
 
 int ox_memcmp(const void *ptr1, const void *ptr2, std::size_t size) noexcept;