_hsearch_r.c: use stdlib.h instead of malloc.h for calloc

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/misc/search/_hsearch_r.c

@@ -18,7 +18,7 @@
    02111-1307 USA.  */
 
 #include <errno.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <search.h>