Fixed bug in tools/setup if docbook was run

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@2015 f882894a-f735-0410-b71e-b25c423dba1c

tools/setup

@@ -47,8 +47,8 @@ else
 fi
 
 if [ $docbook = 1 ] ; then
-	cd doc && make
+	( cd doc && make )
 fi
 
 # Untar libtap
-cd external && tar --gzip -xf tap-1.01-altinity.tar.gz
+( cd external && tar --gzip -xf tap-1.01-altinity.tar.gz )