Commit b55530ad44
("BaseTools/PatchCheck.py: verify commit message lists package(s)")
introduced a check for the requirement to enumerate all modified packages
in the commit subject line. But it did leave the maximum line length at
75 characters (for non-CVE commits), which can get a bit cramped for
changes to several packages.
Introduce a new arbitrary "at least 20 characters after the :" limit.
Signed-off-by: Leif Lindholm <leif.lindholm@oss.qualcomm.com>