Fix include header.

Index: src/studio/screens/console.c
--- src/studio/screens/console.c.orig
+++ src/studio/screens/console.c
@@ -38,7 +38,7 @@
 #include <string.h>
 
 #if !defined(__TIC_MACOSX__)
-#include <malloc.h>
+#include <stdlib.h>
 #endif
 
 #if defined (TIC_BUILD_WITH_LUA)
