[Bug 747711] opencv: make cascades relocatable on win32

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from Nirbheek Chauhan <nirbheek.chauhan at gmail.com> ---
I think we should do this on the Autoconf side since for instance, this is not
needed when building with the Meson build system at all since it invokes
pkg-config directly instead of through the shell. That makes all the paths be
Windows-native ("C:\\blah\\foo\\prefix").

I'll look into this.

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