bisect-runner.pl always needs to pass paths gleaned from gcc to Configure.

bisect-runner.pl always needs to pass paths gleaned from gcc to Configure.

Commits fdbac266ba9ef2a6 and 599ee4f7809ae508 ensure that /usr/local/lib,
/lib and /usr/lib are searched on all platforms for shared libraries, and
that multiarch library locations gleaned from gcc are searched on x86_64.
However, on other Linux architectures it fails to pass the multiarch
locations to Configure. Version (just) prior to 5.14.0 do not contain the
logic to ask gcc, so they fail to build on multiarch setups.

This commit ensures that the correct library locations are available on
all platforms.