common/Scripts: Use extended grep in bash helpers

[joebonrichie]

Summary

• Allows 'foo|bar' syntax

Test Plan

whatuses 'libraw.so|libraw_r.so'

Checklist

• [n/a] Package was built and tested against unstable
• This change could gainfully be listed in the weekly sync notes once merged
• I agree to license this contribution and all my previous contributions under the licensing terms in LICENSE.md and have the power and authority to grant those licenses.

[EbonJaeger]

LGTM, thanks!