[PATCH, preprocessor] Fix 56896

[Ryan Mansfield]

Fixes missing DIR_SEPARATOR if --with-gxx-include-dir configured as 
subdir of sysroot.

2013-12-10  Ryan Mansfield  <rmansfield@qnx.com>

         PR preprocessor/56896
         * incpath.c (add_standard_paths): Strip trailing sysroot 
DIR_SEPARATOR
         only if appended path begins with DIR_SEPARATOR.

Regards,

Ryan Mansfield
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