Fix 'cg' RCore's double-free issue

libr/cons/cons.c

@@ -141,6 +141,7 @@ R_API RCons *r_cons_new () {
 	I.line = r_line_new ();
 	I.event_interrupt = NULL;
 	I.blankline = R_TRUE;
+	I.teefile = NULL;
 	I.heightfix = 0;
 	I.widthfix = 0;
 	I.event_resize = NULL;

libr/core/core.c

@@ -607,6 +607,10 @@ R_API RCore *r_core_fini(RCore *c) {
 	//r_lang_free (c->lang); // XXX segfaults
 	r_debug_free (c->dbg);
 	r_config_free (c->config);
+	/* after r_config_free, the value of I.teefile is trashed */
+	/* rconfig doesnt knows how to deinitialize vars, so we
+	should probably need to add a r_config_free_payload callback */
+	r_cons_singleton()->teefile = NULL; // HACK
 	r_search_free (c->search);
 	r_sign_free (c->sign);
 	r_flag_free (c->flags);

libr/util/str.c

@@ -3,6 +3,7 @@
 #include "r_types.h"
 #include "r_util.h"
 #include <stdio.h>
+#include <string.h>
 #include <ctype.h>
 #include <stdarg.h>