More forte compiler fixes, added a .h file to store commonly used macros that have to ifdefed out on non-gcc compilers

Original commit message from CVS:
More forte compiler fixes, added a .h file to store commonly used macros
that have to ifdefed out on non-gcc compilers
diff --git a/gst/gstmacros.h b/gst/gstmacros.h
new file mode 100644
index 0000000..bb4ef66
--- /dev/null
+++ b/gst/gstmacros.h
@@ -0,0 +1,33 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_MACROS_H__
+#define __GST_MACROS_H__
+
+#if     __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
+#  define GST_GNUC_CONSTRUCTOR \
+  __attribute__ ((constructor))  
+#else  /* !__GNUC__ */
+#  define GST_GNUC_CONSTRUCTOR
+#endif /* !__GNUC__ */
+
+
+#endif /* __GST_MACROS_H__ */
+
+