renamed modules again

[Joe Orton]

[not sure if this made it through to the list first time; resent]

Renamed modules are causing me to lose hair again; would it be OK to do
something like the below, so a call like have_module("proxy_http.c")
will succeed if either a module named either "proxy_http.c" or
"mod_proxy_http.c" is loaded?

Index: Test.pm
===================================================================
--- Test.pm     (revision 153211)
+++ Test.pm     (working copy)
@@ -282,6 +282,7 @@
                 $mod .= '.c'
             }
             next if $cfg->{modules}->{$mod};
+            next if $cfg->{modules}->{'mod_' . $mod };
             if (exists $cfg->{cmodules_disabled}->{$mod}) {
                 push @reasons, $cfg->{cmodules_disabled}->{$mod};
                 next;