patch 9.0.1696: sodium_mlock may still fail in CI

Problem: sodium_mlock may still fail in CI
Solution: Catch E1230 in testscript and skip test

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_crypt.vim b/src/testdir/test_crypt.vim
index 944f216..68e7ca1 100644
--- a/src/testdir/test_crypt.vim
+++ b/src/testdir/test_crypt.vim
@@ -325,7 +325,11 @@
     set undolevels=100
     normal dd
     set undolevels=100
-    w!
+    try
+      w!
+    catch /^Vim\%((\a\+)\)\=:E1230:/ " sodium_mlock() not possible, may happen at Github CI
+    throw 'Skipped: sodium_mlock() not possible'
+    endtry
     call assert_equal(0, &undofile)
     bw!
     call feedkeys(":sp Xcrypt_sodium_undo.txt\<CR>sodium\<CR>", 'xt')