[Image-SIG] patch for 1.1.7 to support automated builds and msys

[Bill Janssen]

I've been building an automated build framework for my UpLib system,
which requires PIL.  I've made a couple of changes to the PIL setup.py
which might go into the standard release, and attach a patch.

Basically two changes:

1.  It's useful to be able to set TIFF_ROOT, JPEG_ROOT, etc. without
editing the setup.py file.  This patch modifies the default values for
those setup variables to be read from the environment, as PIL_TIFF_ROOT,
PIL_JPEG_ROOT, etc.  This allows a build script to just set the
environment variables to pass them in to setup.py.

2.  When linking _imagingft on msys, the auxiliary libraries (-ljpeg,
-lz, etc.) need to be passed as arguments to the link command.  So I've
modified the link code

        if feature.freetype:
            defs = []
            if feature.freetype_version == 20:
                defs.append(("USE_FREETYPE_2_0", None))
            exts.append(Extension(
                "_imagingft", ["_imagingft.c"], libraries=["freetype"],
                define_macros=defs
                ))

to read instead

        if feature.freetype:
            defs = []
            if feature.freetype_version == 20:
                defs.append(("USE_FREETYPE_2_0", None))
            exts.append(Extension(
                "_imagingft", ["_imagingft.c"], libraries=["freetype"] + libs,
                define_macros=defs
                ))

adding back in the necessary libraries.  Similarly for _imagingtiff and
_imagingcms.

Should this perhaps be done only for msys, via an "extra" parameter,
such as that used with _imagingcms?  Be happy to change it, but it seems
to work fine on OS X and Ubuntu, too, as is.

Bill

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