make the installed meta files play nicely with sysroots

pkg-config .pc files use the raw target paths (and pkg-config patches up
-I and -L flags on the fly), so these files were actually already fine.

libtool .la files use the magic prefix = to denote the sysroot.
this works only with libtool 2.4+ (sept 2010).

qmake .prl files have no built-in sysrootification magic, but as they are
read by qmake, it's possible to put property references into them. this
makes them relocatable, both inside and outside sysroots.

Change-Id: I97236ac81e7aba4e4771d14a44cbf59144cc2d3e
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

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