Use clang to compile for Android. Except on mips64, where we have to stick to gcc.

dist-build/android-build.sh

@@ -31,6 +31,8 @@ export PREFIX="$(pwd)/libsodium-android-${TARGET_ARCH}"
 export TOOLCHAIN_DIR="$(pwd)/android-toolchain-${TARGET_ARCH}"
 export PATH="${PATH}:${TOOLCHAIN_DIR}/bin"
 
+export CC=${CC:-"${HOST_COMPILER}-clang"}
+
 rm -rf "${TOOLCHAIN_DIR}" "${PREFIX}"
 
 echo

dist-build/android-mips32.sh

@@ -1,4 +1,4 @@
 #!/bin/sh
 export TARGET_ARCH=mips32
-export CFLAGS="-Os -march=${TARGET_ARCH}"
-ARCH=mips HOST_COMPILER=mipsel-linux-android "$(dirname "$0")/android-build.sh"
+export CFLAGS="-Os"
+ARCH=mips HOST_COMPILER=mips64el-linux-android "$(dirname "$0")/android-build.sh"

dist-build/android-mips64.sh

@@ -1,4 +1,4 @@
 #!/bin/sh
 export TARGET_ARCH=mips64r6
 export CFLAGS="-Os -march=${TARGET_ARCH}"
-NDK_PLATFORM_COMPAT=android-21 ARCH=mips64 HOST_COMPILER=mips64el-linux-android "$(dirname "$0")/android-build.sh"
+CC="mips64el-linux-android-gcc" NDK_PLATFORM_COMPAT=android-21 ARCH=mips64 HOST_COMPILER=mips64el-linux-android "$(dirname "$0")/android-build.sh"