dependencies: add rsync as a required dependency

rsync can now be used for overriden package, and will also be used for
other purposes in the future (optimization of toolchain copy time,
etc.).

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/dependencies/dependencies.sh

@@ -123,7 +123,7 @@ if ! $SHELL --version 2>&1 | grep -q '^GNU bash'; then
 fi;
 
 # Check that a few mandatory programs are installed
-for prog in awk bison flex msgfmt makeinfo patch gzip bzip2 perl tar wget cpio python unzip ${DL_TOOLS} ; do
+for prog in awk bison flex msgfmt makeinfo patch gzip bzip2 perl tar wget cpio python unzip rsync ${DL_TOOLS} ; do
     if ! which $prog > /dev/null ; then
 	/bin/echo -e "\nYou must install '$prog' on your build machine";
 	if test $prog = "makeinfo" ; then