Fix rig_get_caps_int to return long long for cross platform compatibility

https://github.com/Hamlib/Hamlib/issues/562

include/hamlib/rig.h

@@ -1971,7 +1971,7 @@ enum rig_caps_cptr_e {
  *
  */
 //! @cond Doxygen_Suppress
-extern long rig_get_caps_int(rig_model_t rig_model, enum rig_caps_int_e rig_caps);
+extern long long rig_get_caps_int(rig_model_t rig_model, enum rig_caps_int_e rig_caps);
 
 /**
  * \brief Function to return char pointer value from rig->caps

src/misc.c

@@ -2146,7 +2146,7 @@ void *rig_get_function_ptr(rig_model_t rig_model,
  * \param RIG* and rig_caps_int_e
  * \return the corresponding long value -- -RIG_EINVAL is the only error possible
  */
-long rig_get_caps_int(rig_model_t rig_model, enum rig_caps_int_e rig_caps)
+long long rig_get_caps_int(rig_model_t rig_model, enum rig_caps_int_e rig_caps)
 {
     const struct rig_caps *caps = rig_get_caps(rig_model);