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

This reverts commit 4be2bf2502f892afebbb0ea51d621556c0e88019.

For some reason, CC is defined by GNU make by default.

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

Created by  Steven Noonan  on September 30, 2009
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