MFH: r423317

math/eigen3: unbreak consumers on 9.x after r421231

In file included from /usr/local/include/eigen3/unsupported/Eigen/MatrixFunctions:58,

from modules/contrib/src/rgbdodometry.cpp:65:

/usr/local/include/eigen3/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h: In member function 'void Eigen::MatrixExponential<MatrixType>::computeUV(float)':
/usr/local/include/eigen3/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h:296: error: call of overloaded 'pow(int, int&)' is ambiguous
/usr/include/math.h:210: note: candidates are: double pow(double, double)
/usr/include/c++/4.2/cmath:357: note: float std::pow(float, float)
/usr/include/c++/4.2/cmath:361: note: long double std::pow(long double, long double)
/usr/include/c++/4.2/cmath:365: note: double std::pow(double, int)
/usr/include/c++/4.2/cmath:369: note: float std::pow(float, int)
/usr/include/c++/4.2/cmath:373: note: long double std::pow(long double, int)

Reported by: pkg-fallout
Approved by: ports-secteam blanket