stress2: Fix compiler warning about unused variables

tools/test/stress2/misc/datamove.sh

@@ -194,7 +194,7 @@ int startIO(int fd,char *buffer)
   return 0;
 }
 
-int main(int argc,char *argv[],char *envp[])
+int main(void)
 {
 
   int fdA,fdB,fdDelayA,fdDelayB;

tools/test/stress2/misc/datamove2.sh

@@ -194,7 +194,7 @@ startIO(int fd, char *buffer)
 }
 
 int
-main(int argc, char *argv[], char *envp[])
+main(void)
 {
 
 	int	fdA, fdB, fdDelayA, fdDelayB;

tools/test/stress2/misc/datamove3.sh

@@ -192,7 +192,7 @@ startIO(int fd, char *buffer)
 }
 
 int
-main(int argc, char *argv[], char *envp[])
+main(void)
 {
 
 	int fdA, fdB, fdDelayA, fdDelayB;