Perform more C warning fixup on all C source files and headers.

winsup/testsuite/winsup.api/ltp/vfork01.c

@@ -69,10 +69,8 @@
  *
  */
 
-#include <stdio.h>
 #include <sys/types.h>
 #include <errno.h>
-#include <unistd.h>
 #include <fcntl.h>
 #include <string.h>
 #include <signal.h>
@@ -82,7 +80,7 @@
 #include "test.h"
 #include "usctest.h"
 
-char *TCID="vfork01";		/* Test program identifier.    */
+const char *TCID="vfork01";	/* Test program identifier.    */
 int TST_TOTAL=1;		/* Total number of test cases. */
 extern int Tst_count;		/* Test Case counter for tst_* routines */
 int exp_enos[]={0};
@@ -104,7 +102,7 @@ struct stat Stat_cwd_Pbuf;
 struct stat Stat_cwd_Cbuf;
 
 void setup();			/* Main setup function of test */
-void cleanup();			/* cleanup function for the test */
+void cleanup() __attribute__((noreturn));/* cleanup function for the test */
 
 int
 main(int ac, char **av)