Bug#888733: hyantesite: test failures on most architectures

[Rebecca N. Palmer]

> However, the "obvious" fix
> seems to break ra_pareto, for unknown reasons.

It's not this change that breaks ra_pareto: it was _already_ totally 
broken on i386 (all-0s output).

Not using the name 'tmp' for two different variables gives some nonzero 
output:

--- a/src/hyantes.c
+++ b/src/hyantes.c
@@ -65,7 +65,7 @@ hs_config_t g_config = { NULL,0,0,0,500,0,0 }; // 
global configuration used by d
  #define SMOOTHING_FUN EXPONENTIAL
  #include "hyantes_run.c"

-#define PARETO(pot,dst,res,range) do{data_t tmp = POW2(dst); 
res=(pot)*(1./(1+(2/(range)*POW2(tmp))));} while (0)
+#define PARETO(pot,dst,res,range) do{data_t tmpp = POW2(dst); 
res=(pot)*(1./(1+(2/(range)*POW2(tmpp))));} while (0)
  #define SMOOTHING_FUN PARETO
  #include "hyantes_run.c"

but still some big differences.  (ra_pareto is the only test using this 
smoothing function.)