add stdio.h include for msvc, remove truncating cast warning, change to dynamic runtime on msvc. You can not pass FILE * between mods with differrent runtimes on msvc.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@1125 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core.c

@@ -29,6 +29,8 @@
  * switch_core.c -- Main Core Library
  *
  */
+
+#include <stdio.h>
 #include <switch.h>
 //#define DEBUG_ALLOC