Use mandoc database to get man links.

Previously, we semi-manually grabbed the MLINKS from the libressl
Makefiles. The better way is to extract this information from the mandoc
link database files directly, allowing for MLINKS to eventually go away
upstream.

man/update_links.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# Run this periodically to ensure that the manpage links are up to date
+
+echo "# This is an auto-generated file by $0" > links
+sudo makewhatis
+for i in `ls -1 *.3`; do
+  name=`echo $i|cut -d. -f1`
+  links=`sqlite3 /usr/share/man/mandoc.db \
+    "select names.name from mlinks,names where mlinks.name='$name' and mlinks.pageid=names.pageid;"`
+  for j in $links; do
+    if [ "x$j" != "x$name" ]; then
+      echo $name.3,$j.3 >> links
+    fi
+  done
+done

update.sh

@@ -260,25 +260,19 @@ echo "copying manpages"
 	done
 
 	echo "install-data-hook:" >> Makefile.am
-	source ./links
-	for i in $SSL_MLINKS; do
+	for i in `cat ./links`; do
 		IFS=","; set $i; unset IFS
-		echo "	ln -f \$(DESTDIR)\$(mandir)/man3/$1 \\" >> Makefile.am
-		echo "    \$(DESTDIR)\$(mandir)/man3/$2" >> Makefile.am
-	done
-	for i in $TLS_MLINKS; do
-		IFS=","; set $i; unset IFS
-		echo "	ln -f \$(DESTDIR)\$(mandir)/man3/$1 \\" >> Makefile.am
-		echo "    \$(DESTDIR)\$(mandir)/man3/$2" >> Makefile.am
+		if [ "$2" != "" ]; then
+			echo "	ln -f \$(DESTDIR)\$(mandir)/man3/$1 \\" >> Makefile.am
+			echo "    \$(DESTDIR)\$(mandir)/man3/$2" >> Makefile.am
+		fi
 	done
 	echo "" >> Makefile.am
 	echo "uninstall-local:" >> Makefile.am
-	for i in $SSL_MLINKS; do
+	for i in `cat ./links`; do
 		IFS=","; set $i; unset IFS
-		echo "	-rm -f \$(DESTDIR)\$(mandir)/man3/$2" >> Makefile.am
-	done
-	for i in $TLS_MLINKS; do
-		IFS=","; set $i; unset IFS
-		echo "	rm -f \$(DESTDIR)\$(mandir)/man3/$2" >> Makefile.am
+		if [ "$2" != "" ]; then
+			echo "	-rm -f \$(DESTDIR)\$(mandir)/man3/$2" >> Makefile.am
+		fi
 	done
 )