follow-redirects for http://blog.dlang.org

- replaced on master
- just so to temporarily fix doc building on stable

Author: MartinNowak

posix.mak

@@ -563,7 +563,7 @@ $G/dlangspec.verbatim.txt : $G/dlangspec-consolidated.d $(DMD) verbatim.ddoc
 
 $G/dblog_latest.ddoc:
 	@echo "Receiving the latest DBlog article. Disable with DIFFABLE=1"
-	curl -s --retry 3 --retry-delay 5 http://blog.dlang.org | grep -m1 'entry-title' | \
+	curl -s --retry 3 --retry-delay 5 -L http://blog.dlang.org | grep -m1 'entry-title' | \
 		sed -E 's/^.*<a href="(.+)" rel="bookmark">([^<]+)<\/a>.*<time.*datetime="[^"]+">([^<]*)<\/time>.*Author *<\/span><a [^>]+>([^<]+)<\/a>.*/DBLOG_LATEST_TITLE=\2|DBLOG_LATEST_LINK=\1|DBLOG_LATEST_DATE=\3|DBLOG_LATEST_AUTHOR=\4/' | \
 		tr '|' '\n' > $@