[poppler] qt/qt4 config checks, use pkgconfig

[Rex Dieter]

I found that trying to build poppler-qt4 wrappers on fedora core 6
failed on x86_64 due to it's (let's say) "interesting" checks for qt4
headers and libraries.

Attached is a patch to simply use PKG_CHECK_MODULES (ie, pkg-config) for
qt4 (as well as qt) detection.

-- Rex

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