Merge pull request #601 from CosmicFusion/patch-2

fix error: use of undeclared identifier 'free'

src/include/BfdBacktrace.hpp

@@ -17,6 +17,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
+#include <stdlib.h>
 
 #ifdef HAVE_CPLUS_DEMANGLE
 #define HAVE_DECL_BASENAME 1