[OE-core] [PATCH] cpan_build: Fix bashism

[Richard Purdie]

Fix a build failure caused by a bashism and improve quoting whilst in
the area.

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
diff --git a/meta/classes/cpan_build.bbclass b/meta/classes/cpan_build.bbclass
index 0809602..78592be 100644
--- a/meta/classes/cpan_build.bbclass
+++ b/meta/classes/cpan_build.bbclass
@@ -20,7 +20,7 @@ def cpan_build_dep_prepend(d):
 DEPENDS_prepend = "${@cpan_build_dep_prepend(d)}"
 
 cpan_build_do_configure () {
-	if [ ${@is_target(d)} == "yes" ]; then
+	if [ "${@is_target(d)}" = "yes" ]; then
 		# build for target
 		. ${STAGING_LIBDIR}/perl/config.sh
 	fi