Remove android-13's looper.h because it's identical to android-9's
Note that ndk/platforms/android-N only keep delta to previous level
Change-Id: Ibd2c3e168cfe7f6902fdc6eca2e2778d8ccf1fac
1. Fixed missing #include <sys/types.h> in android/asset_manager.h for API >= 13
2. Fixed missing #include <stdint.h> in android/rect_manager.h for API >= 14
3. Added JNICALL to JNI_OnLoad and JNI_OnUnload in jni.h
Change-Id: I875ec0b6e6f7c2f433c176f0a738eb78f3c33062
Allow user code to be compiled with "-mhard-float" for armeabi-v7a
(which implies -mfloat-abi=hard), and either link with
1. Android native APIs which use softfp, or
2. A customized libm_hard.a which is compiled with -mhard-float. Need
-D_NDK_MATH_NO_SOFTFP=1
See tests/device/hard-float/jni/Android.mk for details and restriction
on Clang
Change-Id: I773a842c73368e08b9a6cda0441e95a96fa303b2