Fix missing include in `fmpi_futhark.c`

src/fmpi_futhark.c

@@ -29,6 +29,7 @@
 #include <stdlib.h> // NULL, size_t, free(), malloc()
 // Internal
 #include "internal/fmpi_common.h"
+#include "internal/fmpi_error.h"
 #include "internal/fmpi_futhark_entry.h"
 #include "internal/fmpi_type.h"
 #include "internal/generic/fmpi_generic.h"