Fix to better support python installs where prefix != exec_prefix.#636

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shidesthewise wants to merge 2 commits intopypa:developfrom

shidesthewise:feature/exec_prefixfix-1

Commits on Aug 5, 2014

Patch version from Hans Meine from the duistutils mail list.
ericscheidemantle-dreamworks
committed

Commits on Aug 14, 2014

Fix case where sys.exec_prefix is not a subdir of sys.prefix.
ericscheidemantle-dreamworks
committed