malloc.h is not standard, even on sparc

Index: cextern/cfitsio/lib/eval_l.c
--- cextern/cfitsio/lib/eval_l.c.orig
+++ cextern/cfitsio/lib/eval_l.c
@@ -663,11 +663,7 @@ char *fftext;
 #include <math.h>
 #include <string.h>
 #include <ctype.h>
-#ifdef sparc
-#include <malloc.h>
-#else
 #include <stdlib.h>
-#endif
 #include "eval_defs.h"
 
 ParseData gParse;     /* Global structure holding all parser information     */
