*: 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/runit/chpst.c b/runit/chpst.c
index 82a81f5..21297da 100644
--- a/runit/chpst.c
+++ b/runit/chpst.c
@@ -200,11 +200,11 @@
 		// if yes -> getopt converts strings to numbers for us
 		opt_complementary = "-1:a+:c+:d+:f+:l+:m+:o+:p+:r+:s+:t+";
 		opt = getopt32(argv, "+a:c:d:f:l:m:o:p:r:s:t:u:U:e:"
-			USE_CHPST("/:n:vP012"),
+			IF_CHPST("/:n:vP012"),
 			&limita, &limitc, &limitd, &limitf, &limitl,
 			&limitm, &limito, &limitp, &limitr, &limits, &limitt,
 			&set_user, &env_user, &env_dir
-			USE_CHPST(, &root, &nicestr));
+			IF_CHPST(, &root, &nicestr));
 		argv += optind;
 		if (opt & OPT_m) { // -m means -asld
 			limita = limits = limitl = limitd = limitm;