Android build error

[Wayward1]

Related to b662a45

jni/../jni/src/touchscreengui.cpp:925:71: error: 'getTimeMs' was not declared in this scope
  u32 delta = porting::getDeltaMs(m_key_events[0].down_time, getTimeMs());
                                                                       ^
jni/../jni/src/touchscreengui.cpp:925:71: note: suggested alternative:
In file included from jni/../jni/src/touchscreengui.cpp:27:0:
jni/../jni/src/porting.h:236:12: note:   'porting::getTimeMs'
 inline u64 getTimeMs()
            ^
jni/../jni/src/touchscreengui.cpp: In member function 'void TouchScreenGUI::step(float)':
jni/../jni/src/touchscreengui.cpp:1009:61: error: 'getTimeMs' was not declared in this scope
   u32 delta = porting::getDeltaMs(m_move_downtime,getTimeMs());
                                                             ^
jni/../jni/src/touchscreengui.cpp:1009:61: note: suggested alternative:
In file included from jni/../jni/src/touchscreengui.cpp:27:0:
jni/../jni/src/porting.h:236:12: note:   'porting::getTimeMs'
 inline u64 getTimeMs()
            ^
/home/home/android-ndk-r11c/build/core/build-binary.mk:462: recipe for target 'obj/local/armeabi-v7a/objs/minetest/jni/src/touchscreengui.o' failed
make[2]: *** [obj/local/armeabi-v7a/objs/minetest/jni/src/touchscreengui.o] Error 1