Log Message:
graphics/graphviz: Update to 6.0.1

Remove patch for "tclpkg/gv/Makefile.am" (merged upstream, #2262).

6.0.1 - 2022-09-11
==================

Changed
-------
- *Breaking*: libxdot fields for the size and number of operations,
  the statistics counts, and polygon line points are now size_t values
  instead of int values
- Accuracy of the bounding boxes printed by the showboxes feature have
  been improved.

Fixed
-----
- Id attribute is not used in linearGradient. #2258
- Graphviz 5.0.1 undocumented change of automatically generated output
  filename with -O flag (missing dot separator).
  This was a regression in 5.0.1. #2270
- Assert fail in aaglex for multiple calls to agmemread.
  This was a regression in 5.0.1. #2272

Removed
-------
- The $GV_FILE_PATH sandboxing mechanism has been removed. #2257

5.0.1 - 2022-08-20
==================

Fixed
-----
- -Tx11: Assertion xev.xbutton.button >= 1 && xev.xbutton.button <= 5
   && "Xlib returned invalid button event" failed #2256
- missing Perl includes patch #2262
- smyrna: incorrect tokenization
  in frmobjectui.c:set_attr_object_type #2259
- [Dot] Record shape+UTF+" | "=Eats spaces. #925
- Memory leak in osage
- Segmentation fault when running test example neatopack.c #1800
- Memory leak in dot when using clusters
- Memory leak in patchwork when using clusters
- Subgraph layout and rendering
- Generated SVG files no longer use transparent paint or color as this
  keyword does not exist in SVG 1.1, and instead use none or a zero-
  opacity color.
- Unnecessary space in 'points' attribute for 'polyline' in SVG output
- graphml2gv no longer calls itself cvtgxl in error messages

Added
-----
- GVContext::version() to lib/gvc++
- GVContext::buildDate() to lib/gvc++