Ports: Add mandoc port

Ports/mandoc/patches/add-charclass.patch

@@ -0,0 +1,32 @@
+--- /dev/null	Mon Jan 20 00:15:16 2020
++++ mandoc-1.14.5/charclass.h	Mon Jan 20 00:15:04 2020
+@@ -0,0 +1,29 @@
++/*
++ * Public domain, 2008, Todd C. Miller <millert@openbsd.org>
++ *
++ * $OpenBSD: charclass.h,v 1.2 2019/01/25 00:19:25 millert Exp $
++ */
++
++/*
++ * POSIX character class support for fnmatch() and glob().
++ */
++static struct cclass {
++	const char *name;
++	int (*isctype)(int);
++} cclasses[] = {
++	{ "alnum",	isalnum },
++	{ "alpha",	isalpha },
++	{ "blank",	isblank },
++	{ "cntrl",	iscntrl },
++	{ "digit",	isdigit },
++	{ "graph",	isgraph },
++	{ "lower",	islower },
++	{ "print",	isprint },
++	{ "punct",	ispunct },
++	{ "space",	isspace },
++	{ "upper",	isupper },
++	{ "xdigit",	isxdigit },
++	{ NULL,		NULL }
++};
++
++#define NCCLASSES	(sizeof(cclasses) / sizeof(cclasses[0]) - 1)