Fix --enable-universalsdk and its comment line so that zsh's flag completion

works.

Thanks to Jeroen Ruigrok van der Werven for the fix.

configure

 #! /bin/sh
-# From configure.in Revision: 60484 .
+# From configure.in Revision: 60536 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for python 2.6.
 #
@@ -1312,7 +1312,7 @@ if test -n "$ac_init_help"; then
 Optional Features:
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
-  --enable-universalsdk[SDKDIR]
+  --enable-universalsdk[=SDKDIR]
                           Build against Mac OS X 10.4u SDK (ppc/i386)
   --enable-framework[=INSTALLDIR]
                           Build (MacOSX|Darwin) framework

configure.in

@@ -61,7 +61,7 @@ AC_SUBST(CONFIG_ARGS)
 CONFIG_ARGS="$ac_configure_args"
 
 AC_ARG_ENABLE(universalsdk,
-	AC_HELP_STRING(--enable-universalsdk@<:@SDKDIR@:>@, Build against Mac OS X 10.4u SDK (ppc/i386)),
+	AC_HELP_STRING(--enable-universalsdk@<:@=SDKDIR@:>@, Build against Mac OS X 10.4u SDK (ppc/i386)),
 [
 	case $enableval in
 	yes)