simplify our configure and Makefile.am. Set our CFLAGS and LDFLAGS primarily from configure.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4512 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch.c

@@ -33,6 +33,10 @@
  *
  */
 
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 500
+#endif
+
 #include <switch.h>
 
 /* pid filename: Stores the process id of the freeswitch process */