user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/tests/rtld/search-order/test.c

@@ -0,0 +1,21 @@
+#include <assert.h>
+#include <dlfcn.h>
+
+#ifdef USE_HOST_LIBC
+#define LIBBAR "libnative-bar.so"
+#else
+#define LIBBAR "libbar.so"
+#endif
+
+int foo();
+int bar();
+
+int main() {
+	void *libbar = dlopen(LIBBAR, RTLD_LOCAL | RTLD_NOW);
+	assert(libbar);
+
+	assert(foo() == (int) 0xCAFEBABE);
+	assert(bar() == (int) 0xCAFEBABE);
+
+	return 0;
+}