textproc/gsed: skip panic-tests.sh when running as root...

...for instance as poudriere, because the tests sets up a directory
that is intended to be non-writable, which is ignored on FreeBSD 14,
and causes the panic-tests.sh to fail because sed can unexpectedly
create a temp file when running as root.

textproc/gsed/files/patch-testsuite_panic-tests.sh

@@ -0,0 +1,11 @@
+--- testsuite/panic-tests.sh.orig	2022-01-01 23:00:07 UTC
++++ testsuite/panic-tests.sh
+@@ -18,6 +18,8 @@ print_ver_ sed
+ . "${srcdir=.}/testsuite/init.sh"; path_prepend_ ./sed
+ print_ver_ sed
+ 
++test $(id -u) != 0 || exit 77 # these tests pass unexpectedly if run as root
++
+ #
+ # failure to create temp file
+ #