Correctly link with -lm in Python bindings
#3309
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In certain situations (OS X is where I encountered it), one of the libraries in the CMake
MLPACK_LIBRARIESvariable is"m", to indicate that we should link with-lm. However, every other library inMLPACK_LIBRARIESis a direct path to a library to link against. This means that when compiling Cython bindings, we get command-lines likebut that
misn't very helpful---it needs to be-lm. This patch adds a workaround specifically for this case to the Cython build configuration.