Resolve "Replicate include structure in installation"

Closes #10 (closed)

include/gnss_utils/utils/rcv_position.h

@@ -15,10 +15,7 @@
 #include "gnss_utils/observations.h"
 #include "gnss_utils/navigation.h"
 #include "gnss_utils/utils/transformations.h"
-
-extern "C" {
-#include "rtklib.h"
-}
+#include "gnss_utils/gnss_utils.h"
 
 namespace GnssUtils
 {