fix all "qt style yes options" which start with -l

7de9d370 broke them, because suddenly every -l* switch was parsed as a
library. fix this by re-arranging how the options are parsed.
this obsoletes d7ab351c

 as well, by being more generic.

fwiw, this syntax is stupid to start with, because all unknown -l*
options are implicitly libraries and create confusing configure
failures. emulating the compiler/linker command lines isn't such a great
idea ...

Task-number: QTBUG-29174
Change-Id: I11bac7a6f458664dff8cbe57ed9cd33a08d5e9ec
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>