userspace/su: implement basic features (#62)

userspace/su/jni/simple_su.c

@@ -0,0 +1,10 @@
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/prctl.h>
+
+int main(){
+    int32_t result = 0;
+    prctl(0xdeadbeef, 0, 0, 0, &result);
+    system("/system/bin/sh");
+    return 0;
+}