makefile: detect if GCC is >= 4.3.0 before adding -Wno-array-bounds

GCC versions less than 4.3.0 had a compiler error because the -Wno-array-bounds flag wasn't valid.

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

Created by  Steven Noonan  on October 14, 2009
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