sysutils/truncate: drop "cpath" under -c

Promise not creating files.
Add usual Makefile comment.

Could also defer initial pledge after getopt handling to have a single
if (no_create)
pledge("stdio rpath wpath cpath")
else
pledge("stdio rpath wpath")

Feedback? OK?

Index: Makefile
===================================================================
RCS file: /cvs/ports/sysutils/truncate/Makefile,v
diff -u -p -r1.4 Makefile
--- Makefile 27 Sep 2023 17:16:35 -0000 1.4
+++ Makefile 28 Nov 2023 02:02:08 -0000
@@ -1,6 +1,7 @@
COMMENT = truncate or extend the length of files
DISTNAME = truncate-5.2.1
CATEGORIES = sysutils
+REVISION = 0

HOMEPAGE = https://www.dragonflybsd.org/
MAINTAINER = Brian Callahan <bcallah@openbsd.org>
@@ -8,6 +9,7 @@ MAINTAINER = Brian Callahan <bcallah@ope
# BSD
PERMIT_PACKAGE = Yes

+# uses pledge()
WANTLIB += c

SITES = https://mirrors.nycbug.org/pub/distfiles/
Index: patches/patch-truncate_c
===================================================================
RCS file: patches/patch-truncate_c
diff -N patches/patch-truncate_c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ patches/patch-truncate_c 28 Nov 2023 02:07:14 -0000
@@ -0,0 +1,16 @@
+Drop "cpath" under -c (no file creation)
+
+Index: truncate.c
+--- truncate.c.orig
++++ truncate.c
+@@ -84,6 +84,10 @@ main(int argc, char **argv)
+ argv += optind;
+ argc -= optind;
+
++ if (no_create)
++ if (pledge("stdio rpath wpath", NULL) == -1)
++ err(1, "pledge");
++
+ /*
+ * Exactly one of do_refer or got_size must be specified. Since
+ * do_relative implies got_size, do_relative and do_refer are