Log Message:
graphics/graphviz: Update to 7.0.6

Patch for configure.ac modified (nonportable syntax "==").

## [7.0.6] - 2023-01-06

### Changed

- The Autotools build system no longer looks for `python` binaries. The Python
  interpreter is unconditionally assumed to be `python3`. The configure option
  `--enable-python` is now an alias for `--enable-python3`.
- The Autotools and CMake build systems, when building `gvedit`, will now look
  for and use Qt6 in preference over Qt5. #2233
- Reserved stack size on Windows for the `dot.exe` binary has been increased
  from ~3.8MB to 32MB. #1710
- Reserved stack size on macOS for the `dot` binary when built with CMake has
  been increased from 8MB to 32MB. #1710
- The Autotools build system can now find libANN on Debian-based operating
  systems, enabling compilation of libmingle and `mingle`. #1835
- The `webdot` web server interface to Graphviz has been removed. For a modern
  replacement, see for example https://github.com/magjac/d3-graphviz. #1131

### Fixed

- The modgraph.php example no longer includes gv.php, which is no longer
  generated by SWIG 4.1.0. #2322