gold patch committed: #include <unistd.h> in timer.cc

[Ian Lance Taylor]

The gold file timer.cc can call sysconf, which on some systems requires
#includ'ing <unistd.h>.  This patch does so.  Committed to mainline and
2.22 branch.

Ian


2012-04-06  Ian Lance Taylor  <iant@google.com>

	* timer.cc: #include <unistd.h>.


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