fix: android-x86 target not compiling

The android-x86 target is special in that it statically links to clang_rt.builtins. The path
to these libraries were wrong, pointing to a non-exising directory in the android NDK. We fix
it by starting from the  `resource-dir` instead and navigate from there instead of `runtime-dir`
which doesn't always point the right place on all platforms.

Author: typfel

Makefile

@@ -346,7 +346,7 @@ $(ANDROID_X86): $(android-x86-deps) | android-env
 	  $(CARGO_BUILD_ARGS) -- \
 	  -C strip=symbols \
 	  -l static=clang_rt.builtins-x86_64-android \
-	  -L $$($(ANDROID_NDK_HOME)/toolchains/llvm/prebuilt/$(PLATFORM_DIR)/bin/clang --print-runtime-dir)
+	  -L $$($(ANDROID_NDK_HOME)/toolchains/llvm/prebuilt/$(PLATFORM_DIR)/bin/clang --print-resource-dir)/lib/linux
 
 .PHONY: android-x86
 android-x86: $(ANDROID_X86) ## Build core-crypto-ffi for x86_64-linux-android