Allow pycrypto to build when PATH includes SAGE_ROOT
Matplotlib depends on pkgconf, not the pkgconfig python module
Trac #16084: matplotlib dependency on pkgconf

The matplotlib dependency is wrong, this is probably the reason for the
build failure on old OSX versions where it fails to find freetype. If
you build serial / almost serial then pkgconf is not build before
matplotlib. On highly parallel builds, pkgconf finishes much before
matplotlib is started.

URL: http://trac.sagemath.org/16084
Reported by: vbraun
Ticket author(s): Volker Braun
Reviewer(s): John Palmieri
Trac #16049: allow pycrypto to build if SAGE_ROOT is in PATH

If `$SAGE_ROOT` is in `$PATH`, then `pycrypto` may fail to build: the
command `sh configure` in `setup.py` can mistakenly execute
`$SAGE_ROOT/configure`.

URL: http://trac.sagemath.org/16049
Reported by: jhpalmieri
Ticket author(s): John Palmieri
Reviewer(s): Thierry Monteil