Log Message:
py-distlib: updated to 0.3.9

0.3.9

- scripts

    - Merge: preload script wrappers on Windows to assist with a pip issue (thanks,
      Paul Moore).
    - Fix: Remove duplicated newline in shebang of windows launcher (thanks. A2uria).
    - Fix: Add handling for cross-compilation environments (thanks, Russell \ 
Keith-Magee).

- util

    - Fix: Do not use the absolute path to cache wheel extensions (thanks, \ 
Stewart Miles).

- wheel

    - Fix: Support mounting wheels that use extensions without an EXTENSIONS \ 
file (thanks,
      Stewart Miles).
    - Fix: Add support for wheel compatibility with the limited API (thanks, \ 
Stewart Miles).