8.1.0388

• 8.1.0375: Cannot use diff mode with Cygwin diff.exe. (Igor Forca) Skip
  over unrecognized lines in the diff output.
• 8.1.0376: Compiler warning for uninitialized variable. (Tony
  Mechelynck) Initialize the variable.
• 8.1.0377: Xdiff doesn't use the Vim memory allocation functions.
  Change the xdl_ defines. Check for out-of-memory. Rename "ignored" to
  "vim_ignored".
• 8.1.0378: CI build failure. Include vim.h as ../vim.h. Fix compiler
  warning.
• 8.1.0379: Build dependencies are incomplete. Update the build
  dependencies, mainly for xdiff. Adjust object directory for libvterm
  and xdiff.
• 8.1.0380: "make proto" doesn't work well. Define a few more types for
  cproto. Update proto files. Fix that workshop didn't build.
• 8.1.0381: Variable declaration not at start of block. Fix line
  ordering.
• 8.1.0382: Some make programs can't handle dependency on "xdiff/../".
  Strip it out.
• 8.1.0383: Missing source file rename. Update the dependency.
• 8.1.0384: Sign ordering depends on +netbeans feature. Also order signs
  without +netbeans. (Christian Brabandt, closes #3224)
• 8.1.0385: Coveralls badge doesn't update. Update the URL
• 8.1.0386: Cannot test with non-default option value. Add
  test_option_not_set().
• 8.1.0387: No test for 'ambiwidth' detection. Add a test.
• 8.1.0388: Coverity complains about possible NULL pointer use. Use
  get_tv_string() instead of get_tv_string_chk().