util/*/Makefile: allow compiler selection on command-line

Allows neat compilers like 'llvm-gcc' or even experimental ones like 'clang' to be used.

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

Created by  Steven Noonan  on September 29, 2009
MT254K7AOX4DTAAS5EZRKF5JY4BS5ITWG2S5CE2IF22QKVGPCLMAC
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