cpan.bbclass: remove bashisms

git-svn-id: https://svn.o-hand.com/repos/poky/trunk@4153 311d38ba-8fff-0310-9ca6-ca027cbcb966

meta/classes/cpan.bbclass

@@ -50,13 +50,13 @@ cpan_do_compile () {
 }
 
 cpan_do_install () {
-	if [ ${@is_target(d)} == "yes" ]; then
+	if [ ${@is_target(d)} = "yes" ]; then
 		oe_runmake install_vendor
 	fi
 }
 
 cpan_do_stage () {
-	if [ ${@is_target(d)} == "no" ]; then
+	if [ ${@is_target(d)} = "no" ]; then
 		oe_runmake install_vendor
 	fi
 }