bug#10934: 24.0.94; cperl system abbrevs fix

[Leo]

In cperl-mode it uses a hack to avoid having programmably-defined
abbrevs written to the abbrev file. This is not safe i.e. those abbrevs
can still be saved to disk, and users might be tricked to edit them but
lose their editing because they are redefined by cperl-mode.

I think the following patch is due.

commit 0d5a31c8fc9faf708e98bee32913bc2dfe31bf7d
Date:   Fri Apr 16 21:09:01 2010 +0100

    Fix cperl-mode abbrevs
    
    See http://permalink.gmane.org/gmane.emacs.devel/123752.
---
 lisp/progmodes/cperl-mode.el |   44 ++++++++++++++++++++----------------------
 1 file changed, 21 insertions(+), 23 deletions(-)

        Modified lisp/progmodes/cperl-mode.el
diff --git a/lisp/progmodes/cperl-mode.el b/lisp/progmodes/cperl-mode.el
index eb881d01..3a332b24 100644
--- a/lisp/progmodes/cperl-mode.el
+++ b/lisp/progmodes/cperl-mode.el
@@ -1714,29 +1714,27 @@ (defun cperl-mode ()
                          [(control c) (control h) f])))
   (setq major-mode cperl-use-major-mode)
   (setq mode-name "CPerl")
-  (let ((prev-a-c abbrevs-changed))
-    (define-abbrev-table 'cperl-mode-abbrev-table '(
-               ("if" "if" cperl-electric-keyword 0)
-               ("elsif" "elsif" cperl-electric-keyword 0)
-               ("while" "while" cperl-electric-keyword 0)
-               ("until" "until" cperl-electric-keyword 0)
-               ("unless" "unless" cperl-electric-keyword 0)
-               ("else" "else" cperl-electric-else 0)
-               ("continue" "continue" cperl-electric-else 0)
-               ("for" "for" cperl-electric-keyword 0)
-               ("foreach" "foreach" cperl-electric-keyword 0)
-               ("formy" "formy" cperl-electric-keyword 0)
-               ("foreachmy" "foreachmy" cperl-electric-keyword 0)
-               ("do" "do" cperl-electric-keyword 0)
-               ("=pod" "=pod" cperl-electric-pod 0)
-               ("=over" "=over" cperl-electric-pod 0)
-               ("=head1" "=head1" cperl-electric-pod 0)
-               ("=head2" "=head2" cperl-electric-pod 0)
-               ("pod" "pod" cperl-electric-pod 0)
-               ("over" "over" cperl-electric-pod 0)
-               ("head1" "head1" cperl-electric-pod 0)
-               ("head2" "head2" cperl-electric-pod 0)))
-       (setq abbrevs-changed prev-a-c))
+  (define-abbrev-table 'cperl-mode-abbrev-table
+    '(("if" "if" cperl-electric-keyword 0 t)
+      ("elsif" "elsif" cperl-electric-keyword 0 t)
+      ("while" "while" cperl-electric-keyword 0 t)
+      ("until" "until" cperl-electric-keyword 0 t)
+      ("unless" "unless" cperl-electric-keyword 0 t)
+      ("else" "else" cperl-electric-else 0 t)
+      ("continue" "continue" cperl-electric-else 0 t)
+      ("for" "for" cperl-electric-keyword 0 t)
+      ("foreach" "foreach" cperl-electric-keyword 0 t)
+      ("formy" "formy" cperl-electric-keyword 0 t)
+      ("foreachmy" "foreachmy" cperl-electric-keyword 0 t)
+      ("do" "do" cperl-electric-keyword 0 t)
+      ("=pod" "=pod" cperl-electric-pod 0 t)
+      ("=over" "=over" cperl-electric-pod 0 t)
+      ("=head1" "=head1" cperl-electric-pod 0 t)
+      ("=head2" "=head2" cperl-electric-pod 0 t)
+      ("pod" "pod" cperl-electric-pod 0 t)
+      ("over" "over" cperl-electric-pod 0 t)
+      ("head1" "head1" cperl-electric-pod 0 t)
+      ("head2" "head2" cperl-electric-pod 0 t)))
   (setq local-abbrev-table cperl-mode-abbrev-table)
   (if (cperl-val 'cperl-electric-keywords)
       (abbrev-mode 1))