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The aim is to turn (e.g.) libmonochrome.so into monochrome, but in the
secondary abi case the path passed has a directory component, which
means that an incorrect library name is generated.

This CL changes the implementation to be more robust to directory
components and the length of the extension.

Bug: 988041
Change-Id: Idfca8a38bbb4fdd2a136a64f14c9f00b675776c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1720876Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681853}