Problem with Red Hat's Vim 7.0.237 and SpellCheck.vim

At work, my home directory resides on a file server and is
auto-mounted to whatever machine I log on to. One of the servers I
occasionally log on to is running Red Hat Enterprise Linux Server
release 5 and another is running CentOS release 5.11. Vim on both
is:

VIM - Vi IMproved 7.0 (2006 May 7, compiled Jan 8 2013 23:55:00)
Included patches: 1, 3-4, 7-9, 11, 13-17, 19-26, 29-31, 34-44, 47, 50-56, 58-64, 66-73, 75, 77-92, 94-107, 109, 202, 234-237
Modified by <bugzilla@redhat.com>
Compiled by <bugzilla@redhat.com>
Huge version without GUI. Features included (+) or not (-):

When I start vim on either machine, I get the following error
messages.

Error detected while processing /home/garyjohn/.vim/plugin/SpellCheck.vim:
line 37:
E700: Unknown function: SpellCheck#AutoEnableSpell
line 40:
E700: Unknown function: SpellCheck#SpellAddWrapper

Here is the relevant portion of that plugin (revision 1.21.007).

28 " Avoid installing twice or when in unsupported Vim version.
29 if exists('g:loaded_SpellCheck') || (v:version < 700)
30 finish
31 endif
32 let g:loaded_SpellCheck = 1
33
34 "- configuration ---------------------------------------------------------------
35
36 if ! exists('g:SpellCheck_OnNospell')
37 let g:SpellCheck_OnNospell = function('SpellCheck#AutoEnableSpell')
38 endif
39 if ! exists('g:SpellCheck_OnSpellAdd')
40 let g:SpellCheck_OnSpellAdd = function('SpellCheck#SpellAddWrapper')
41 endif

I would like to put some test in my ~/.vimrc that would determine
whether this plugin could be successfully loaded and set
g:loaded_SpellCheck if not, but I don't know what that test should
be. Testing for Vim version 7.0 or greater is not sufficient.
$VIMRUNTIME/autoload exists and I don't get errors from other
plugins that use autoloaded functions. I'd like to use something
more reliable and general than to just test for those particular
servers or those particular OSs.

Thoughts?

Thanks,
Gary

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