- Update to tcsh bug fix version V6.22.02 - 20191204
* Fix version in configure.ac

- Drop patches
* tcsh-6.21.0-history-file-locking.patch
As upstream introduced its own history file locking
* tcsh-6.18.03-history-merge.dif
To respect upstream history merge handling
* tcsh-6.19.00-history-file-locking-order.patch
Not required due dropped tcsh-6.21.0-history-file-locking.patch
* tcsh-6.20.00-avoid-dotlock-for-fcntl.patch
Not required due dropped tcsh-6.21.0-history-file-locking.patch
* tcsh-6.18.01-history-stderror-jmp.patch
Not required due dropped tcsh-6.21.0-history-file-locking.patch

- Update to tcsh bug fix version V6.22.01 - 20191201
* undo PR/88: Preserve empty arguments in :q, since it breaks
$ set x=""
$ alias test "echo "\""$x:q"\"" is working."
$ alias test
echo "

- Update to tcsh bug fix version V6.22.00 - 20191128
* PR/113: Sobomax: avoid infinite loops for -c commands when stdout is
not a tty.
* Avoid infinite loops during history loads when merging, print a better
error for errors during history load.
* PR/88: Preserve empty arguments in :q
* PR/94: Small apple issues (SAVESIGVEC, HOSTTYPE)
* PR/81: Fix range matching issue where we were comparing with the