Adding Skip to mb_strrpos test case.  Skips the test if mbstring is installed and php version is 5.1.x.  mb_strrpos had an incompatible function signature in these versions.
Adding Skip to mb_strrpos test case.  Skips the test if mbstring is installed and php version is 5.1.x.  mb_strrpos had an incompatible function signature in these versions.

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