since commit 22edeb3f4 (private; anno 2002), the generator would extract
-prebind and translate it into a PREBINDING property in the pbx file.
the writeout to the pbx file got lost in the rewrite for Xcode 3.2
(commit 66f6e5b1; anno 2012).
this isn't particularly bad, as prebinding is obsolete since OS X 10.3.4.
we now go the last mile and remove the handling of the flag. that means
that remaining projects which still use it (meaninglessly) will get a
warning from Xcode, which is kinda what we want.
QMAKE_LFLAGS should have never been part of the library iteration loop.
it was added there in the prebind handling commit, so we can get rid of
it again now.
Change-Id: Id7dee2b1e248bb2bd7aa7a3e66f82057921afffd
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>
8e797477b9