Another autotools wrapper problem and fix

[Jon A. Lambert]

Okay this one is picking at gnits, but autoheader 1.9 will always issue a 
warning message when you ask it to produce warning message because the 
authoheader wrapper passes --warning= and -W as --warning=,blah,blah 
and -W,blah,blah instead of --warning=blah,blah and -Wblah,blah.

Here's another patch.  I think this works.
--------------------
$ diff -ru autoheader-orig autoheader
--- autoheader-orig     2003-12-02 01:21:50.001000000 -0500
+++ autoheader  2004-12-05 09:28:10.570940800 -0500
@@ -115,12 +115,14 @@
    --warnings=* | -W?* )
-       warnings=$warnings,$optarg
+       test $warnings && warnings=$warnings,$optarg
+       test -z $warnings && warnings=$optarg
       shift ;;
    --warnings | -W )
       test $# = 1 && eval "$exit_missing_arg"
       shift
-       warnings=$warnings,$1
+       test $warnings && warnings=$warnings,$1
+       test -z $warnings && warnings=$1
       shift ;;
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