updated to 7.4.608

updated to 7.4.608

7.4.590  using ctrl_x_mode as if it contains flags
7.4.591  test_listlbr_utf8 fails when conceal feature is not available
7.4.592  buffer with 'buftype' "nofile" is cleared on re-edit
7.4.593  crash when searching for "x\{0,90000}"
7.4.594  using block delete with 'breakindent' does not work properly
7.4.595  the test_command_count test fails when using Japanese
7.4.596  (after 7.4.592) tiny build doesn't compile
7.4.597  cannot change the result of systemlist()
7.4.598  ":tabdo windo echo 'hi'" causes "* register not to be changed
7.4.599  out-of-memory error for complicated search pattern
7.4.600  memory wasted in struct because of aligning
7.4.601  it is not possible to have feedkeys() insert characters
7.4.602  ":set" does not accept hex numbers as documented
7.4.603  'foldcolumn' may fill the whole window
7.4.604  running tests changes viminfo
7.4.605  the # register cannot be restored after jumping around
7.4.606  may crash when using a small window
7.4.607  (after 7.4.598) compiler warnings for unused variables
7.4.608  (after 7.4.598) test_eval fails without the clipboard feature