- Update to new upstream release 10.31
* New pcre2_config() options: PCRE2_CONFIG_NEVER_BACKSLASH_C and
PCRE2_CONFIG_COMPILED_WIDTHS.
* New pcre2_pattern_info() option PCRE2_INFO_EXTRAOPTIONS to
retrieve the extra compile time options.
* Public names for all pcre2_compile() error numbers.
* Added PCRE2_CALLOUT_STARTMATCH and PCRE2_CALLOUT_BACKTRACK
bits to a new field callout_flags in callout blocks.
- use https for main site
- cleanup with spec-cleaner