android交叉编译
/share/px30_from_weiqin/miro/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.9/bin/arm-linux-androidkernel-gcc \
test_word_count.c \
--static -o test_ndk \
--sysroot=/share/px30_from_weiqin/miro/prebuilts/ndk/r11/platforms/android-21/arch-arm/