scripts/renamepatches: Optimize search
Use bash hashmap instead of grepping list file.
sample:
5.0s -> 2.5s
Composed result with previous commit on SLE15-SP4->SLE15-SP5:
original
Executed in 207.82 secs fish external
usr time 263.64 secs 459.00 micros 263.64 secs
sys time 60.61 secs 185.00 micros 60.61 secs
optimized
Executed in 65.73 secs fish external
usr time 49.16 secs 639.00 micros 49.16 secs
sys time 18.52 secs 0.00 micros 18.52 secs