Update to scdoc-1.11.1, and add pledge which is a good fit for this

software. From Martin Vahlensieck

textproc/scdoc/Makefile

@@ -1,7 +1,7 @@
-# $OpenBSD: Makefile,v 1.2 2020/04/04 16:58:26 schwarze Exp $
+# $OpenBSD: Makefile,v 1.3 2021/03/16 17:00:59 sthen Exp $
 
 COMMENT =		convert scdoc text files to man(7) pages
-VERSION =		1.10.1
+VERSION =		1.11.1
 DISTNAME =		scdoc-${VERSION}
 CATEGORIES =		textproc
 HOMEPAGE =		https://git.sr.ht/~sircmpwn/scdoc
@@ -12,6 +12,7 @@ PERMIT_PACKAGE =	Yes
 MASTER_SITES =		https://git.sr.ht/~sircmpwn/scdoc/
 DISTFILES =		scdoc-{archive/}${VERSION}${EXTRACT_SUFX}
 
+# uses pledge(2)
 WANTLIB =		c
 
 USE_GMAKE =		Yes

textproc/scdoc/distinfo

@@ -1,2 +1,2 @@
-SHA256 (scdoc-1.10.1.tar.gz) = gOAhxzLMos1mWdzPMwbUb1nuy/j7qk2r21AvU3J4p48=
-SIZE (scdoc-1.10.1.tar.gz) = 12422
+SHA256 (scdoc-1.11.1.tar.gz) = EJih7S4IdZb8Cz9lfByKXgBBImeqS682GeNoJDBmRbE=
+SIZE (scdoc-1.11.1.tar.gz) = 12510

textproc/scdoc/patches/patch-src_main_c

@@ -0,0 +1,28 @@
+$OpenBSD: patch-src_main_c,v 1.1 2021/03/16 17:00:59 sthen Exp $
+
+Simple software acting as an stdio filter, no third party libraries,
+not big churn, so this is a good candidate for pledge.
+
+--- src/main.c.old
++++ src/main.c
+@@ -15,6 +15,7 @@
+ 
+ char *strstr(const char *haystack, const char *needle);
+ char *strerror(int errnum);
++int pledge(const char *, const char *);
+ 
+ static struct str *parse_section(struct parser *p) {
+ 	struct str *section = str_create();
+@@ -755,6 +756,12 @@ int main(int argc, char **argv) {
+ 		fprintf(stderr, "Usage: scdoc < input.scd > output.roff\n");
+ 		return 1;
+ 	}
++
++	if (pledge("stdio", NULL) == -1) {
++		fprintf(stderr, "pledge: %s", strerror(errno));
++		exit(EXIT_FAILURE);
++	}
++
+ 	struct parser p = {
+ 		.input = stdin,
+ 		.output = stdout,