Minor twekas to fix three bug reports.

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@20368 72102866-910b-0410-8b05-ffd578937521

Source/NSMessagePort.m

@@ -1459,7 +1459,9 @@ static int unique_index = 0;
 {
   NSMapEnumerator	me;
   int			sock;
+#ifndef	BROKEN_SO_REUSEADDR
   int			opt = 1;
+#endif
   GSMessageHandle	*handle = nil;
 
   M_LOCK(myLock);

Source/NSNotificationCenter.m

@@ -1137,30 +1137,6 @@ static NSNotificationCenter *default_center = nil;
 
 @implementation	NSNotificationCenter (GNUstep)
 
-- (BOOL) setImmutableInPost: (BOOL)flag
-{
-  BOOL	old;
-
-  lockNCTable(TABLE);
-
-  if (self == default_center)
-    {
-      unlockNCTable(TABLE);
-      [NSException raise: NSInvalidArgumentException
-		  format: @"Can't change behavior of default center."];
-    }
-  if (LOCKCOUNT > 1)
-    {
-      unlockNCTable(TABLE);
-      [NSException raise: NSInvalidArgumentException
-		format: @"Can't change behavior during post."];
-    }
-
-  unlockNCTable(TABLE);
-  
-  return old;
-}
-
 - (BOOL) setLockingDisabled: (BOOL)flag
 {
   BOOL	old;

Source/NSPropertyList.m

@@ -2179,7 +2179,7 @@ GSPropertyListMake(id obj, NSDictionary *loc, BOOL xml,
 		     format: (NSPropertyListFormat*)aFormat
 	   errorDescription: (NSString**)anErrorString
 {
-  NSPropertyListFormat	format;
+  NSPropertyListFormat	format = 0;
   NSString		*error = nil;
   id			result = nil;
   const unsigned char	*bytes = 0;
@@ -2222,10 +2222,9 @@ GSPropertyListMake(id obj, NSDictionary *loc, BOOL xml,
 	  if (length - index > 2
 	    && bytes[index] == '<' && bytes[index+1] == '?')
 	    {
-#ifdef	HAVE_LIBXML
 	      // It begins with '<?' so it is xml
 	      format = NSPropertyListXMLFormat_v1_0;
-#else
+#ifndef	HAVE_LIBXML
 	      error = @"XML format not supported ... XML support not present.";
 #endif
 	    }