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

winsup/testsuite/winsup.api/ltp/truncate01.c

@@ -84,13 +84,13 @@
 #define FILE_SIZE	1024			/* test file size */
 #define TRUNC_LEN	256			/* truncation length */
 
-char *TCID="truncate01";	/* Test program identifier.    */
+const char *TCID="truncate01";	/* Test program identifier.    */
 int TST_TOTAL=1;		/* Total number of test conditions */
 extern int Tst_count;		/* Test Case counter for tst_* routines */
 int exp_enos[]={0};
 
 void setup();			/* setup function for the test */
-void cleanup();			/* cleanup function for the test */
+void cleanup(void) __attribute__((noreturn));			/* cleanup function for the test */
 
 int
 main(int ac, char **av)