mbedtls: restore patch to fix build on aarch64

Still necessary on aarch64.

pkgs/development/libraries/mbedtls/3.nix

···
 callPackage ./generic.nix {
   version = "3.6.4";
   hash = "sha256-y5YqKtjW4IXyIZkoJvwCGC4scx0qdeV40rynHza4NUE=";
+
+  patches = [
+    # Fixes the build with GCC 14 on aarch64.
+    #
+    # See:
+    # * <https://github.com/openwrt/openwrt/pull/15479>
+    # * <https://github.com/Mbed-TLS/mbedtls/issues/9003>
+    (fetchurl {
+      url = "https://raw.githubusercontent.com/openwrt/openwrt/52b6c9247997e51a97f13bb9e94749bc34e2d52e/package/libs/mbedtls/patches/100-fix-gcc14-build.patch";
+      hash = "sha256-20bxGoUHkrOEungN3SamYKNgj95pM8IjbisNRh68Wlw=";
+    })
+  ];
 }