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Fix compilation on Android with GNU STL (#596)

* Fix compilation on Android with GNU STL

GNU STL in Android NDK lacks string conversion functions from C++11, including std::stoul, std::stoi, and std::stod.
This patch reimplements these functions in benchmark:: namespace using C-style equivalents from C++03.

* Avoid use of log2 which doesn't exist in Android GNU STL

GNU STL in Android NDK lacks log2 function from C99/C++11.
This patch replaces their use in the code with double log(double) function.

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