System library paths not stripped correctly

[Andrew Oakley]

If a package has (for example) "Libs: -L/usr/lib -L/usr/lib" then only
the first of these is stripped.  This is because the iterator is
advanced twice when we are removing the unnecessary options.

I've raised a bug about this but the mailing list appeared to be broken
at the time (so I guess no-one noticed).

https://bugs.freedesktop.org/show_bug.cgi?id=78077

-- 
Andrew Oakley