UBUNTU: [Debian] pass LOCAL_ENV_CC and LOCAL_ENV_DISTCC_HOSTS properly

BugLink: https://launchpad.net/bugs/1744077Signed-off-by: Wen-chien Jesse Sung <jesse.sung@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

debian/rules.d/0-common-vars.mk

@@ -230,7 +230,7 @@ kmake = make ARCH=$(build_arch) \
 	LOCALVERSION= localver-extra= \
 	CFLAGS_MODULE="-DPKG_ABI=$(abinum)"
 ifneq ($(LOCAL_ENV_CC),)
-kmake += CC=$(LOCAL_ENV_CC) DISTCC_HOSTS=$(LOCAL_ENV_DISTCC_HOSTS)
+kmake += CC="$(LOCAL_ENV_CC)" DISTCC_HOSTS="$(LOCAL_ENV_DISTCC_HOSTS)"
 endif
 
 # Locking is required in parallel builds to prevent loss of contents