Update ksh93-git to use the ksh93u+m dev branch

Currently, the only actively maintaned fork of ksh93 is ksh93u+m. This
commit updates the ksh93-git AUR package to use 93u+m's dev branch.

Other changes:
- Support for pfksh was removed from ksh93u+m, so drop that from the AUR
  package.
- Add support for rksh and ksh93 to /etc/shells.
- Update the example kshrc for use with ksh93u+m (I've made sure that it
  remains backward compatible with ksh93u+ and ksh2020, should anyone
  happen to use an older version of ksh).

1 files changed, 1 insertions, 1 deletions

diff --git a/.gitignore b/.gitignore
index 60fa0c9c46f4..388e0f7c562d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 pkg/
 src/
 ksh93/
-*.xz
+*.zst