fix: Library name fail if library does not exist

[Arrowana]

Problem

One can easily provide incorrect library name to --library-name, typoed, not leading to building with the relative path and leading to an odd failure at the very end of the build

Example failure output for solana-verify build --library-name WrongName

Finished building program
Program Solana version: v2.2.1
Error: Failed to parse output

Solution

Make the logic to find the relative path strict, returning on the match. Not allowing silently not finding a match when specified