[NDK] Fix RTL_PAGED_CODE macro in user mode

NOP_FUNCTION is defined to "(void)0". Calling :
RTL_PAGED_CODE();
in user mode was changed to:
(void)0();

As "0" is not callable, this was leading to a compilation error.

sdk/include/ndk/rtlfuncs.h

···
 //
 // This macro does nothing in user mode
 //
-#define RTL_PAGED_CODE NOP_FUNCTION
+#define RTL_PAGED_CODE()
 
 #endif