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