[Bug 747711] New: W32: gstopencvface{detect,blur} uses hardcoded default paths

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747711

            Bug ID: 747711
           Summary: W32: gstopencvface{detect,blur} uses hardcoded default
                    paths
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lrn1986 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Default cascade paths are hardcoded as:

OPENCV_PREFIX + PATH_TO_CASCADE

where OPENCV_PREFIX is obtained by pkg-conifg from opencv.pc

First problem is that w32 pkg-config by default gets a DOS version
of OPENCV_PREFIX, so the resulting cascade path is:
A) Absolute
B) DOS

This can be fixed by passing --dont-define-prefix to pkg-config
(a trick well-known to anyone who builds anything with MinGW/MSYS),
which makes it output prefix that starts with '/' (usually '/mingw').

So now cascade path is:
A) Absolute
B) POSIX

Which fixes nothing, since Windows does not understand POSIX paths.

However, in this case some code and path wizardry can fix the situation
(see the patch attached).

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