dhrystone: fix compilation problems

This patch fixes two compilation errors with original
dhrystone sources:
* Redefinition of times() with wrong return type
  - Fixed by commenting out the unnecessary redefinition
* Undefined identifier HZ
  - Originally HZ was supposed to be the clock frequency
    value for times()
  - For Linux, the frequency should come from sysconf
  - This patch defines global varible HZ and initializes
    it from sysconf

Additionally, this patch adds a simple Makefile.

Upstream-status: Pending

Sign-off-by: Kimmo Surakka <kimmo.surakka@ge.com>
Signed-off-by: Jose Alarcon <jose.alarcon@ge.com>
---

diff -Naur dhry.orig/dhry_1.c dhry/dhry_1.c
--- dhry.orig/dhry_1.c	2015-07-20 14:25:58.059945353 +0300
+++ dhry/dhry_1.c	2015-07-20 12:43:25.318945353 +0300
@@ -45,11 +45,15 @@
 
 #ifdef TIMES
 struct tms      time_info;
-extern  int     times ();
+/* extern  int     times (); */
                 /* see library function "times" */
 #define Too_Small_Time 120
                 /* Measurements should last at least about 2 seconds */
 #endif
+#ifndef HZ
+#include <unistd.h>  /* sysconf */
+   long HZ;
+#endif
 #ifdef TIME
 extern long     time();
                 /* see library function "time"  */
@@ -84,6 +88,9 @@
 
   /* Initializations */
 
+#ifndef HZ
+  HZ = sysconf(_SC_CLK_TCK);
+#endif
   Next_Ptr_Glob = (Rec_Pointer) malloc (sizeof (Rec_Type));
   Ptr_Glob = (Rec_Pointer) malloc (sizeof (Rec_Type));
 
diff -Naur dhry.orig/dhry.h dhry/dhry.h
--- dhry.orig/dhry.h	2015-07-20 14:25:58.054945353 +0300
+++ dhry/dhry.h	2015-07-20 12:42:59.903945353 +0300
@@ -420,4 +420,6 @@
           } variant;
       } Rec_Type, *Rec_Pointer;
 
-
+#ifndef HZ
+   extern long HZ;
+#endif
diff -Naur dhry.orig/Makefile dhry/Makefile
--- dhry.orig/Makefile	1970-01-01 02:00:00.000000000 +0200
+++ dhry/Makefile	2015-07-20 14:10:45.832945353 +0300
@@ -0,0 +1,15 @@
+CC=gcc
+
+all: dhry
+
+dhry: dhry_1.o dhry_2.o
+	$(CC) $(LDFLAGS) -o $@ $^ $(LOADLIBES) $(LDLIBS)
+
+dhry_1.o: dhry_1.c dhry.h
+
+dhry_2.o: dhry_2.c dhry.h
+
+clean:
+	rm -f *.o *~
+
+.PHONY: all clean