* add ability to build packages even if there is a file with the same name in anaconda/bin

I'm still not clear why recipes are not allowed to be build if there is a file with the same name in anaconda/bin

e.g. anaconda/bin has a file called: patchelf

workerm@notebookpc:~/anaconda/bin$ ./conda-build patchelf
Ignoring non-recipe: patchelf

specifying the full path is ok
workerm@notebookpc:~/anaconda/bin$ ./conda-build /home/workerm/anaconda/conda-recipes/patchelf

**are there any good reason one can not use the standard: ./conda-build patchelf**

anyway: here is a patch for it - but if there are good reason please explain I would like to understand it.

P