awk array iteration which could result in the wrong library being chosen.
Fixes issue seen with GCC 4.9 where the libgcc from the main GCC package
was found first and caused errors, even though the RPATH correctly had
the gcc49-libs version listed first.
check-shlibs. This allows more stricter detection (e.g. it checks
whether the package links against a build dependency). It also checks
whether the rpath contains wrkdir references (like qt3-libs). It depends
on readelf and is only available for ELF systems for now. To test it,
add USE_CHECK_SHLIBS_ELF to mk.conf.
Supported-by: Google SoC 2007
