Don't include parson.h in librrd.h

There's no need for it and it otherwise needs to be packaged in the
devel RPM.

Signed-off-by: Robert Breker <[email protected]>

Author: Robert Breker

librrd.h

@@ -24,7 +24,6 @@
 
 #include <stdint.h>
 #include <time.h>
-#include "parson/parson.h"
 
 #define RRD_MAX_SOURCES         16