Merged revisions 87796 via svnmerge from

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  r87796 | david.malcolm | 2011-01-06 12:01:36 -0500 (Thu, 06 Jan 2011) | 6 lines

  Issue #10655: Fix the build on PowerPC on Linux with GCC when building with
  timestamp profiling (--with-tsc): the preprocessor test for the PowerPC
  support now looks for "__powerpc__" as well as "__ppc__": the latter seems to
  only be present on OS X; the former is the correct one for Linux with GCC.
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