Fix for tar on Solaris

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@2074 f882894a-f735-0410-b71e-b25c423dba1c

tools/setup

@@ -51,4 +51,4 @@ if [ $docbook = 1 ] ; then
 fi
 
 # Untar libtap
-( cd external && tar --gzip -xf tap-1.01-nagios-plugins.tar.gz )
+( cd external && gunzip -c tap-1.01-nagios-plugins.tar.gz | tar -xf - )