updated to 7.4.812

updated to 7.4.812

7.4.797  crash when using more command line lines than 'maxcombine'
7.4.798  repeating a change in Visual mode does not work as expected
7.4.799  accessing memory before an allocated block
7.4.800  using freed memory when triggering CmdUndefined autocommands
7.4.801  (after 7.4.769) ":diffoff" test could catch more problems
7.4.803  C indent does not support C11 raw strings
7.4.804  Xxd doesn't have a license notice
7.4.805  ruler shows "Bot" when there are only filler lines missing
7.4.806  CTRL-A in Visual mode fails with "alpha" in 'nrformat'
7.4.807  (after 7.4.798) after CTRL-V CTRL-A mode isn't updated
7.4.808  on MS-Windows 10 IME input doen't work correctly
7.4.810  sequence of commands using buffers in diff mode gives E749
7.4.811  invalid memory access when using "exe 'sc'"
7.4.812  Gcc sanitizer complains about using NULL pointer to memmove()