Yuriy Khokhulya authored May 11, 2017 and Brad King committed May 12, 2017

During search of the library file `pkg_check_modules()` attempts to find
it in last specified library path in `${_prefix}_LDFLAGS`, that after
dependency resolving contains path to standard location.

So in case when `${_prefix}_LDFLAGS` has:

    -L/prefix;-L/usr/local/lib;-llibrary_from_prefix;-ldependency

`library_from_prefix` will not be found.

As solution need try to find the library in all paths preceding to the
library.

Fixes: #16873