[libgfortran, patch] Remove runtime TRANSPOSE support functions

[FX]

Since 2010, gfortran does not rely on library support functions to handle TRANSPOSE, but instead emits code directly in the front-end (https://gcc.gnu.org/ml/fortran/2010-09/msg00109.html). We have since kept the various _gfortran_transpose_* functions in libgfortran for ABI compatbility, but we can now remove them.

Attached patch bootstrapped and regtested on x86_64-apple-darwin16.3.0.
OK to commit?

FX

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