Updated runtime files.
updated for version 7.4.023
Problem:    Compiler warning on 64 bit windows.
Solution:   Add type cast. (Mike Williams)
Added tag v7-4-023 for changeset 09361f13580b
updated for version 7.4.024
Problem:    When root edits a file the undo file is owned by root while the
	    edited file may be owned by another user, which is not allowed.
	    (cac2s)
Solution:   Accept an undo file owned by the current user.
Added tag v7-4-024 for changeset 00d61a47df66
updated for version 7.4.025
Problem:    Reading before start of a string.
Solution:   Do not call mb_ptr_back() at start of a string. (Dominique Pelle)
Added tag v7-4-025 for changeset 9085d32d7424
updated for version 7.4.026
Problem:    Clang warning for int shift overflow.
Solution:   Use unsigned and cast back to int. (Dominique Pelle)
Added tag v7-4-026 for changeset 6bbb2ae990c9
updated for version 7.4.027
Problem:    Another valgrind error when using CTRL-X CTRL-F at the start of
	    the line. (Dominique Pelle)
Solution:   Don't call mb_ptr_back() at the start of the line.  Add a test.
Added tag v7-4-027 for changeset 73cc7272de5e
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
updated for version 7.4.031
Problem:    ":diffoff!" resets options even when 'diff' is not set. (Charles
	    Cooper)
Solution:   Only resets related options in a window where 'diff' is set.
Added tag v7-4-031 for changeset b21b5dcdca21