makefile: don't use intermediate .compflag.h file

It's not necessary, because the compflag.h header will never exist, because the makefile has it marked as an .INTERMEDIATE, which means it's deleted automatically if the build is cancelled or finishes.

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

Created by  Steven Noonan  on October 18, 2009
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