NB: This commit adds an implicit run-time dependency to pcre2 for enhanced
pattern searches.
* patchutils/PKGBUILD:
- update to 0.4.2
- add dependency to pcre2/pcre2-devel (new feature since 0.4.0)
- run build in separate directory
- add function check (NB: patchutils 0.4.2: all checks succeed.)
- add license to package