Update all packages to quote $(TARGET_CC)

Now that TARGET_CC contains several space-separated words, it must be
used quoted everywhere.

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

package/docker/docker.mk

@@ -10,7 +10,7 @@ DOCKER_AUTORECONF = NO
 DOCKER_INSTALL_STAGING = NO
 DOCKER_INSTALL_TARGET = YES
 
-DOCKER_MAKE_OPT = CC=$(TARGET_CC) CXX=$(TARGET_CXX) LD=$(TARGET_LD) \
+DOCKER_MAKE_OPT = CC="$(TARGET_CC)" CXX="$(TARGET_CXX)" LD="$(TARGET_LD)" \
 					CFLAGS="-I$(STAGING_DIR)/usr/include \
 						-I$(STAGING_DIR)/usr/include/glib-2.0 \
 						-I$(STAGING_DIR)/usr/lib/glib-2.0/include" \