support/dependencies/dependencies.sh: check for 'cmp'

cmp from diffutils is part of the host system requirements, so check
for it. It is used in package/pkg-generic.mk.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/dependencies/dependencies.sh

@@ -163,7 +163,7 @@ fi
 
 # Check that a few mandatory programs are installed
 missing_progs="no"
-for prog in perl tar wget cpio unzip rsync bc ${DL_TOOLS} ; do
+for prog in perl tar wget cpio unzip rsync bc cmp ${DL_TOOLS} ; do
 	if ! which $prog > /dev/null ; then
 		echo "You must install '$prog' on your build machine";
 		missing_progs="yes"
@@ -175,6 +175,8 @@ for prog in perl tar wget cpio unzip rsync bc ${DL_TOOLS} ; do
 			echo "  zcat is usually part of the gzip package in your distribution"
 		elif test $prog = "bzcat" ; then
 			echo "  bzcat is usually part of the bzip2 package in your distribution"
+		elif test $prog = "cmp" ; then
+			echo "  cmp is usually part of the diffutils package in your distribution"
 		fi
 	fi
 done