This reverts commit 4be2bf2502f892afebbb0ea51d621556c0e88019.
For some reason, CC is defined by GNU make by default.
Signed-off-by: Steven Noonan <steven@uplinklabs.net>
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MT254K7AOX4DTAAS5EZRKF5JY4BS5ITWG2S5CE2IF22QKVGPCLMAC
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3A537UMVZSYIFVKVO3SVK5JRSRLDN3YJKK3RKELHR2D4U6CMKM4QC
CC ?= gcc
CC = gcc
CC= gcc