Update libx264 cross building scripts

Signed-off-by: Leo Ma <begeekmyfriend@gmail.com>

library/src/main/cpp/libx264/android_build_arm64_v8a.sh

@@ -4,7 +4,6 @@ ANDROID_NDK=$HOME/Android/Sdk/ndk-bundle
 SYSROOT=$ANDROID_NDK/platforms/android-21/arch-arm64
 CROSS_PREFIX=$ANDROID_NDK/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64/bin/aarch64-linux-android-
 EXTRA_CFLAGS="-march=armv8-a -D__ANDROID__"
-EXTRA_LDFLAGS="-nostdlib"
 PREFIX=`pwd`/libs/arm64-v8a
 ./configure --prefix=$PREFIX \

library/src/main/cpp/libx264/android_build_armeabi_v7a.sh

@@ -4,7 +4,6 @@ ANDROID_NDK=$HOME/Android/Sdk/ndk-bundle
 SYSROOT=$ANDROID_NDK/platforms/android-19/arch-arm
 CROSS_PREFIX=$ANDROID_NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-
 EXTRA_CFLAGS="-march=armv7-a -mfloat-abi=softfp -mfpu=neon -D__ANDROID__ -D__ARM_ARCH_7__ -D__ARM_ARCH_7A__"
-EXTRA_LDFLAGS="-nostdlib"
 PREFIX=`pwd`/libs/armeabi-v7a
 ./configure --prefix=$PREFIX \

library/src/main/cpp/libx264/android_build_x86.sh

@@ -4,7 +4,6 @@ ANDROID_NDK=$HOME/Android/Sdk/ndk-bundle
 SYSROOT=$ANDROID_NDK/platforms/android-19/arch-x86
 CROSS_PREFIX=$ANDROID_NDK/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/i686-linux-android-
 EXTRA_CFLAGS="-D__ANDROID__ -D__i686__"
-EXTRA_LDFLAGS="-nostdlib"
 PREFIX=`pwd`/libs/x86
 ./configure --prefix=$PREFIX \