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This fix is required for libstdc++ build with 4.6 where version of
compiler is 4.6.x-google but script expects 4.6. Other versions are not
affected.

Change-Id: I31f88c80aa323435c77414c593a445a468d5a704
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>