user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/tests/bsd/ns_get_put.c

@@ -0,0 +1,21 @@
+#include <assert.h>
+#include <arpa/nameser.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+int main() {
+	uint8_t *buf = malloc(256);
+	uint16_t original16 = 4891;
+	uint32_t original32 = 4861984;
+	memset(buf, 0x0, sizeof(*buf));
+	ns_put16(original16, buf);
+	uint16_t result16 = ns_get16(buf);
+	assert(result16 == original16);
+	memset(buf, 0x0, sizeof(*buf));
+	ns_put32(original32, buf);
+	uint32_t result32 = ns_get32(buf);
+	assert(result32 == original32);
+	free(buf);
+	return 0;
+}