package/canfestival: don't build in parallel

The Makefiles for canfestival are not correctly written, which leads to
multiple warnings such as:

    make[4]: warning: jobserver unavailable: using -j1. Add `+' to parent make rule.

Since canfestival is relatively small, it builds in less than 6s here
when not in parallell, while a parallel build takes 5s.

Just disable parallel build to avoid future surprises.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/canfestival/canfestival.mk

@@ -36,13 +36,13 @@ define CANFESTIVAL_CONFIGURE_CMDS
 endef
 
 define CANFESTIVAL_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) all \
+	$(TARGET_MAKE_ENV) $(MAKE1) -C $(@D) all \
 		PYTHON=$(HOST_DIR)/usr/bin/python2
 endef
 
 define CANFESTIVAL_INSTALL_TARGET_CMDS
 	for d in $(CANFESTIVAL_INSTALLED-y) ; do \
-		$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)/$$d install \
+		$(TARGET_MAKE_ENV) $(MAKE1) -C $(@D)/$$d install \
 			PYTHON=$(HOST_DIR)/usr/bin/python2 \
 			DESTDIR=$(TARGET_DIR) || exit 1 ; \
 	done
@@ -50,7 +50,7 @@ endef
 
 define CANFESTIVAL_INSTALL_STAGING_CMDS
 	for d in $(CANFESTIVAL_INSTALLED-y) ; do \
-		$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)/$$d install \
+		$(TARGET_MAKE_ENV) $(MAKE1) -C $(@D)/$$d install \
 			PYTHON=$(HOST_DIR)/usr/bin/python2 \
 			DESTDIR=$(STAGING_DIR) || exit 1 ; \
 	done