android: fix llvm, elf dependencies for M, N releases

These changes set the correct llvm version and elf include path
which differ for Marshmallow and Nougat

Cc: "17.0" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
(cherry picked from commit 9c45bb731c97d1f02f83b872c67b2c1b04ec3a41)
[Emil Velikov: resolve trivial conflicts]
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>

Conflicts:
	Android.common.mk
3 files changed