Stop working around broken IPv6 site

This basically reverts 324212ce which
forced wget to only use IPv4.

dev-www.libreoffice.org's IPv6 support was broken for a while.  It
appears to be back to working.

Change-Id: Ib235ddd5719089eaf9d4559bd913571fc46069d1
Reviewed-on: https://gerrit.libreoffice.org/33558Reviewed-by: jan iversen <jani@documentfoundation.org>
Tested-by: jan iversen <jani@documentfoundation.org>

Makefile.fetch

@@ -11,7 +11,7 @@ fetch_LOGFILE := $(TARFILE_LOCATION)/fetch.log
 
 ifneq (,$(WGET))
 define fetch_Download__wget_command
-&& bash -c '$(WGET) --progress=dot:mega -4 -Q 0 -P "." -l 0 -nd -nH -N --no-use-server-timestamps $1/$2 2>&1 | tee -a $(fetch_LOGFILE) && [ $$PIPESTATUS -eq 0 ]'
+&& bash -c '$(WGET) --progress=dot:mega -Q 0 -P "." -l 0 -nd -nH -N --no-use-server-timestamps $1/$2 2>&1 | tee -a $(fetch_LOGFILE) && [ $$PIPESTATUS -eq 0 ]'
 endef
 
 else