README: add cloning information

Signed-off-by: Luc Verhaegen <libv@skynet.be>
lib:ump: remove -march from FLAGS

This gets in the way when building on fedora.

Signed-off-by: Luc Verhaegen <libv@skynet.be>
Reported-by: Eric Molitor <emolitor@molitor.org>
build: add abi detection for fedora

gcc -dumpmachine returns armv7hl-redhat-linux-gnueabi for hardfloat.
Google told me that the softfp abi is called armv5tel-redhat-linux-gnueabi

Signed-off-by: Luc Verhaegen <libv@skynet.be>
Reported-by: Eric Molitor <emolitor@molitor.org>
include:ump: error out when MALI_VERSION is unknown

Also remove some bogus and leftover debug warning from lib/ump.

Signed-off-by: Luc Verhaegen <libv@skynet.be>