updated for version 7.4.028
Problem:    Equivalence classes are not working for multi-byte characters.
Solution:   Copy the rules from the old to the new regexp engine. Add a test
	    to check both engines.
Added tag v7-4-028 for changeset 923738744a60
updated for version 7.4.029
Problem:    An error in a pattern is reported twice.
Solution:   Remove the retry with the backtracking engine, it won't work.
Added tag v7-4-029 for changeset 2d3fbc68b3a8
Add files missing from 7.4.028.
updated for version 7.4.030
Problem:    The -mno-cygwin argument is no longer supported by Cygwin.
Solution:   Remove the arguments. (Steve Hall)
Added tag v7-4-030 for changeset 0978e99043d2
Merge with master.
Auto version upgrade (7.4.030)