Updated runtime files.
updated for version 7.4.156
Problem:    Test file missing from distribution.
Solution:   Add new directory to file list.
Added tag v7-4-156 for changeset 05a5cb0d6b37
updated for version 7.4.157
Problem:    Error number used twice. (Yukihiro Nakadaira)
Solution:   Change the one not referred in the docs.
Added tag v7-4-157 for changeset be61f315eafe
updated for version 7.4.158
Problem:    Pattern containing \zs is not handled correctly by substitute().
Solution:   Change how an empty match is skipped. (Yukihiro Nakadaira)
Added tag v7-4-158 for changeset d59544f3022b
updated for version 7.4.159
Problem:    Completion hangs when scanning the current buffer after doing
	    keywords. (Christian Brabandt)
Solution:   Set the first match position when starting to scan the current
	    buffer.
Added tag v7-4-159 for changeset a95a151402be
updated for version 7.4.160
Problem:    Win32: Crash when executing external command.
Solution:   Only close the handle when it was created. (Yasuhiro Matsumoto)
Added tag v7-4-160 for changeset f29febf858be