Fixed by using updated preinstalled NSIS with string length 8192.
Fixes https://gitlab.com/graphviz/graphviz/-/issues/1770.
- Incorrect 'Arrow type "s" unknown' error #1444
- segfault on reading 0x10 #1724
- Null-dereference READ (144736912) #1676
+- "Warning! PATH too long installer unable to modify PATH!" using CMake Windows installer and PATH length > 1024 [#1770]
## [2.44.1] - 2020-06-29
-Subproject commit 3501466fce99380d503841c63116cc8f69cd21fd
+Subproject commit 3948728fbf9352024bdcaf7e08fab45e1be3d2fd