Fix a load of warnings from implicit function declarations. A lot were caused by ctype.h and string.h stuff being used everywhere in GNUstep but not included anywhere - they're now included in common.h (at least string.h should also be in Foundation.h - on OS X it is implicitly included via some chain of things from Foundation.h).

All of the sel_* stuff is now replaced with the newer APIs.  As a side-effect, a blob of code that was copied-and-pasted all over GNUstep has now been moved into ObjectiveC2 and just called.

Class posing with libobjc2 will now throw an exception, rather than just aborting.  



git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@31268 72102866-910b-0410-8b05-ffd578937521

Source/NSObject.m

@@ -1400,7 +1400,7 @@ objc_create_block_classes_as_subclasses_of(Class super) __attribute__((weak));
    * used by the Distributed Objects system, which the
    * runtime does not maintain in classes.
    */
-  int count;
+  unsigned int count;
   Protocol **protocols = class_copyProtocolList(isa, &count);
   if (NULL != protocols)
     {
@@ -1467,7 +1467,12 @@ objc_create_block_classes_as_subclasses_of(Class super) __attribute__((weak));
  */
 + (void) poseAsClass: (Class)aClassObject
 {
+#ifdef __GNUSTEP_RUNTIME__
+  [NSException raise: NSInternalInconsistencyException
+              format: @"Class posing is not supported"];
+#else
   class_pose_as(self, aClassObject);
+#endif
   /*
    *	We may have replaced a class in the cache, or may have replaced one
    *	which had cached methods, so we must rebuild the cache.