tests: avoid compiler warnings Silence more warnings during coreutils build. * tests/test-fcntl.c (main): Delete unused parameters. * tests/test-freopen-safer.c (main): Likewise. * tests/test-xalloc-die.c (main): Mark unused parameters. * tests/test-fseeko.c (main): Likewise. * tests/test-ftello.c (main): Likewise. * tests/test-nanosleep.c (main): Avoid declaration warning. * tests/test-sleep.c (main): Likewise. * tests/test-unsetenv.c (main): Silence warning about string literal. * m4/setenv.m4 (gl_FUNC_UNSETENV): Likewise. Signed-off-by: Eric Blake <ebb9@byu.net>

--- a/tests/test-freopen-safer.c
+++ b/tests/test-freopen-safer.c
@@ -45,7 +45,7 @@
   while (0)
 
 int
-main (int argc, char **argv)
+main (void)
 {
   FILE *fp;