configure: Make the import lib name optional in WINE_CONFIG_DLL.

aclocal.m4

@@ -242,7 +242,7 @@ wine_fn_config_dll ()
     ac_dir=dlls/$ac_name
     ac_enable=$[2]
     ac_flags=$[3]
-    ac_implib=$[4]
+    ac_implib=${4:-$ac_name}
     ac_file=$ac_dir/lib$ac_implib
     ac_deps="tools/widl tools/winebuild tools/winegcc include"
     ac_implibflags=""

tools/make_makefiles

@@ -386,7 +386,7 @@ sub update_makefiles(@)
             $args .= "," if $is_win16 || @flags;
             $args .= "enable_win16" if $is_win16;
             $args .= ",[" . join(",",@flags) ."]" if @flags;
-            $args .= ",[$implib]" if $implib;
+            $args .= ",[$implib]" if $implib && $implib ne $name;
             push @lines, "WINE_CONFIG_DLL($name$args)\n";
         }
         elsif ($rules eq $makerules{"MAKE_PROG_RULES"})