patch 8.0.0445: getpgid is not supported on all systems

Problem:    Getpgid is not supported on all systems.
Solution:   Add a configure check.

patch 8.0.0444: diffpatch fails when the file name has a quote

Problem:    Diffpatch fails when the file name has a quote.
Solution:   Escape the name properly. (zetzei)

patch 8.0.0443: terminal width is set to 80 in test3

Problem:    Terminal width is set to 80 in test3.
Solution:   Instead of setting 'columns' set 'wrapmargin' depending on
            'columns.

patch 8.0.0442: patch shell command not well escaped

Problem:    Patch shell command uses double quotes around the argument, which
            allows for $HOME to be expanded. (Etienne)
Solution:   Use single quotes on Unix. (closes vim#1543)

patch 8.0.0441: dead code in #ifdef

Problem:    Dead code in #ifdef.
Solution:   Remove the #ifdef and #else part.

patch 8.0.0440: not enough test coverage in Insert mode

Problem:    Not enough test coverage in Insert mode.
Solution:   Add lots of tests.  Add test_override(). (Christian Brabandt,
            closes vim#1521)

patch 8.0.0439: ":%argdel" gives an error for an empty arglist

Problem:    Using ":%argdel" while the argument list is already empty gives an
            error. (Pavol Juhas)
Solution:   Don't give an error. (closes vim#1546)

patch 8.0.0438: the fnamemodify test may cause later tests to fail

Problem:    The fnamemodify test changes 'shell' in a way later tests may not
            be able to use system().
Solution:   Save and restore 'shell'.

patch 8.0.0437: packadd test does not fully work

Problem:    The packadd test does not create the symlink correctly and does
            not test the right thing.
Solution:   Create the directory and symlink correctly.

patch 8.0.0436: running the options test sometimes resizes the terminal

Problem:    Running the options test sometimes resizes the terminal.
Solution:   Clear out t_WS.