- Modernise spec file

- Update to version 2.0+git.20240123.d981242:
* fix typos (#260)
* Add checksum support to py2lcov, perl2lcov
* Simplify extracted function name for Python code: ignore params.
* Report timestamp error at most once per file.
* Refactor 'py2lcov' translator:
* Move 'py2lcov' utility to 'bin' directory (from 'share/lcov/support-scripts') - to make it consistent with the perl2lcov utility.
* Add 'perl2lcov' script - to translate Perl Devel::Cover data into lcov format. See 'perl2lcov --help' and the Devel::Cover documentation, for usage.
* Functionality: implement 'genhtml --select-script ..' callback to select subset of coverpoints to show in HTML report. The expected use case is code review, when we want to show only the changes caused by a particular commit or set of commits - say, to show the new code as well as any coverage gains or losses outside of the code change. See the '--select-script' section of the genhtml man page, as well as the 'review' section in the 'example' directory.
* Ignore coverpoints on line numbers <= 0; remove from DB if error message is ignored. There clearly are no such lines in any file. These happen for certain branches generated by Coverage.py.
* Bugfix: ignore lambdas during function end line derivation - they would need to be found syntactically. Recommend user to upgrade to newer compiler.
* Fix typo (#257)
* Fix RPM specification
* Fix broken makefile.
* Bugfox: do not push --base-directory onto source-dir list multiple times (issue #254)
* Bugfix: typo - issue #255
* Bugfix: fix #253 - broken geninfo_adjust_src_path RC option. Also deprecate the option in favor of 'substitute = ....' - which is more general and does better error checking.
* Bugfix: ERROR_COUNT message
* Improved error message wording (singular/plural)
* Remove explicit man page names from Makefile - we may have some non-public doc that we don't want to name. Revert some Makefile changes to fix rpm target.
* Fix man page formatting.
* Documentation: clarify filtering association with source language.
* Add compute_file_version option to insert source file version post-facto - e.g., if some tool did not support versioning.
* Improve debug/diagnostic experience: add context information if callback fails.
* Add '--abbrev regexp' option to gitblame.pm This enables easy author grouping - say, for those inside vs outside the company.
* Bring README/doc up to date.
* Show full path (including prefix) in directory/file table tooltip.
* FUNCTIONALITY: add message type 'missing' to handle case that some .info file is missing. Goal is to enable mechanism for user's job to continue in the presence of errors.