Add the -DUPDATE_APPCAST=TRUE option to invoke the UpdateAppcast.cmake
script, which clones the github pages repo and sets the version in the
appcast.xml to the last tag, presumably made with -DTAG_RELEASE.
The script prints out a final set of instructions to actually push the
change to git.
If the option -DUPDATE_APPCAST=UNDO is used, the clone is removed and no
changes are made.
Also use the correct method of splitting the tag list output into
multiple lines.
Signed-off-by: Rafael Kitover <rkitover@gmail.com>
Rafael Kitover