tclconfig.sh has references to _build_env

[minrk]

tclconfig.sh has:

# Name of the ranlib program to use.
TCL_RANLIB='/Users/travis/miniconda3/conda-bld/tk_1542320991838/_build_env/bin/x86_64-apple-darwin13.4.0-ranlib'

causing compilation of packages (oommf-feedstock in my case) to fail. I think setting RANLIB=$(basename $RANLIB) ought to fix this

[ndevenish]

Also seeing references to the original compiler (on linux only, not macos), causing a downstream to get that wrong:

% rg '/_build_env'
ENV/lib/tclConfig.sh
19:TCL_CC='/home/conda/feedstock_root/build_artifacts/tk_1645033378611/_build_env/bin/x86_64-conda-linux-gnu-cc'
96:TCL_RANLIB='/home/conda/feedstock_root/build_artifacts/tk_1645033378611/_build_env/bin/x86_64-conda-linux-gnu-ranlib'