Make declaration visible to implementation.

tests/pio_write.c

@@ -26,9 +26,6 @@ typedef int MPI_Comm;
 #include "pio_util.h"
 #endif
 
-void
-modelRun(struct model_config setup, MPI_Comm comm);
-
 static const struct model_config default_setup
 #ifdef __cplusplus
 = { 12, 6, 3, 5, 5, FILETYPE_GRB, DATATYPE_PACK24,1,"grb"};

tests/pio_write.h

@@ -15,4 +15,7 @@ struct model_config
   const char *suffix;
 };
 
+void
+modelRun(struct model_config setup, MPI_Comm comm);
+
 #endif