[PATCH] buildsys: skip compiler flag checking for clean targets

[Mike Frysinger]

On Sunday 15 January 2012 13:11:58 Mike Frysinger wrote:
> As suggested by Bernhard, there is no point in evaluating the compiler's
> flag availability when cleaning, so skip things in that case.  If there
> are variables that change targets based on the flags, then things are
> already broken and need fixing independently.

this improves my `make clean` time from ~2.4s to ~1.5s.  i should be able 
shave some more off that by fixing up the include_clean target.
-mike
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