sync code with last improvements from OpenBSD

dist/fontconfig/doc/check-missing-doc

@@ -0,0 +1,24 @@
+#!/bin/sh
+header=fontconfig-header
+doc=fontconfig-doc
+trap "rm $header $doc"  0 1 15
+top_srcdir=${top_srcdir-".."}
+(
+cat $top_srcdir/fontconfig/*.h  | grep '^Fc' | 
+ grep -v FcPublic | sed 's/[^a-zA-Z0-9].*//';
+ cat $top_srcdir/fontconfig/*.h  | 
+ sed -n 's/#define \(Fc[a-zA-Z]*\)(.*$/\1/p') |
+ sort -u > $header
+
+grep '@FUNC[+]*@' $top_srcdir/doc/*.fncs |
+awk '{print $2}' |
+sort -u > $doc
+
+if cmp $doc $header > /dev/null; then
+	exit 0
+fi
+
+echo \
+'Library Export							Documentation'
+diff -y $header $doc | grep '[<>]'
+exit 1