[poppler] [PATCH] configure: do not override user supplied LIBJPEG_LIBS

[Michael Stahl]

re-sending this, apparently it got lost in the other thread since Albert
requested review from somebody with autoconf knowledge.

> due to the various autoconf macros it was a bit non-obvious to figure
> out that, unlike LIBJPEG_CFLAGS, LIBJPEG_LIBS is a variable that is
> always overwritten by configure and effectively cannot be set from the
> outside; i could set LIBJPEG_CFLAGS to include the link parameters but i
> can't prevent configure from checking for a libjpeg6b.so so if such
> exists on a system (it doesn't on Fedora) then it's possible that we get
> funny DT_NEEDEDs from "-ljpeg -ljpeg6b".
> 
> so i wrote the attached patch.
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