Help: `versionadded` directives for Help/cpack_gen, Help/envvar and Help/generator
Another batch of .. versionadded
goodness.
I highly suggest back-porting the second commit (Help/envvar changes) to the 3.19 branch.
Environment variable docs were added late (3.10) and the version script stamped them with the wrong versions (e.g. CFLAGS
has been available since forever, but is currently marked 3.10).
Generators could use more version notes, but there isn't enough documentation to add the notes to.
Issue: #19715