* Update android-armv7-a.sh
update HOST_COMPILER variable to be compatible with updated android-build.sh that supports latest ndk and use of prebuilt toolchains.
* Update android-build.sh
update to allow use of prebuilt toolchains in latest ndk. The latest ndk does not support arm prior to armv7a and the HOST_COMPILER for armv7a must now be armv7a not just arm.
* Delete android-arm.sh
arm prior to armv7a is no longer supported by android ndk.
* Update android-build.sh
removing unneeded MAKE_TOOLCHAIN variable
* Update Makefile.am
removing obsolete android targets
* Delete android-mips32.sh
* Delete android-mips64.sh