*: mass renaming of USE_XXXX to IF_XXXX
and SKIP_XXXX to IF_NOT_XXXX - the second one was especially
badly named. It was not skipping anything!

diff --git a/selinux/setfiles.c b/selinux/setfiles.c
index 8185d78..b410d7e 100644
--- a/selinux/setfiles.c
+++ b/selinux/setfiles.c
@@ -544,9 +544,9 @@
 			&exclude_dir, &input_filename, &out_filename, &verbose);
 	} else { /* setfiles */
 		flags = getopt32(argv, "de:f:ilnpqr:svo:FW"
-				USE_FEATURE_SETFILES_CHECK_OPTION("c:"),
+				IF_FEATURE_SETFILES_CHECK_OPTION("c:"),
 			&exclude_dir, &input_filename, &rootpath, &out_filename,
-				 USE_FEATURE_SETFILES_CHECK_OPTION(&policyfile,)
+				 IF_FEATURE_SETFILES_CHECK_OPTION(&policyfile,)
 			&verbose);
 	}