Revert "alien.libraries.finder: Add utiltity word find-first-library to find a shared library from a list of library stem names." Wrong fix.

This reverts commit 8cd883be5119683291c2ee6d7ce4fad228b78e26.
Revert "pcre.ffi: Fix pcre for Arch Linux 32bit on 64bit multilib." Wrong fix.

This reverts commit c6e335f570da9a2c44635a53fdc4ad56ee77f3b4.
alien.libraries.finder: Linux32 ldconfig has (libc6) or (libc6,x32) as the platform strings. Refactor parsing to not use regular expressions and change the matching from exact to requiring the ldconfig line to be a subset of the supported platforms.
aline.libraries.finder.linux: Fix spacing. oops