Do not rely on BSD style echo (which accepts -n option)

http://www.opengroup.org/onlinepubs/7990989775/xcu/echo.html

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6072 c046a42c-6fe2-441c-8c8c-71466251a162

configure

@@ -1094,7 +1094,7 @@ config_h="config-host.h"
 test -f $config_h && mv $config_h ${config_h}~
 
 echo "# Automatically generated by configure - do not modify" > $config_mak
-echo -n "# Configured with:" >> $config_mak
+printf "# Configured with:" >> $config_mak
 printf " '%s'" "$0" "$@" >> $config_mak
 echo >> $config_mak
 echo "/* Automatically generated by configure - do not modify */" > $config_h