tweak core for build err and add core_get_var

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4021 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_core.h

@@ -472,6 +472,13 @@ SWITCH_DECLARE(switch_core_session_t *) switch_core_session_locate(char *uuid_st
 */
 SWITCH_DECLARE(char *) switch_core_get_variable(char *varname);
 
+/*! 
+  \brief Add a global variable to the core
+  \param varname the name of the variable
+  \param value the value of the variable
+*/
+SWITCH_DECLARE(void) switch_core_set_variable(char *varname, char *value);
+
 /*! 
   \brief Hangup All Sessions
   \param cause the hangup cause to apply to the hungup channels