Add large address aware flag

This allows the final exe to use more than 2gb of RAM in a 64-bit system
which should get rid of most out of memory errors on 32-bit builds

src/win32/Makefile.cfg

@@ -164,3 +164,7 @@ else
 endif
 	LIBS+=-ldiscord-rpc
 endif
+
+ifndef MINGW64
+	LDFLAGS+=-Wl,--large-address-aware
+endif