bzip2: fix passing of TARGET_MAKE_ENV to make

TARGET_MAKE_ENV is not passed to make because it is on a different
line without a backslash.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/bzip2/bzip2.mk

@@ -12,13 +12,13 @@ BZIP2_LICENSE_FILES = LICENSE
 
 ifeq ($(BR2_STATIC_LIBS),)
 define BZIP2_BUILD_SHARED_CMDS
-	$(TARGET_MAKE_ENV)
+	$(TARGET_MAKE_ENV) \
 		$(MAKE) -C $(@D) -f Makefile-libbz2_so $(TARGET_CONFIGURE_OPTS)
 endef
 endif
 
 define BZIP2_BUILD_CMDS
-	$(TARGET_MAKE_ENV)
+	$(TARGET_MAKE_ENV) \
 		$(MAKE) -C $(@D) libbz2.a bzip2 bzip2recover $(TARGET_CONFIGURE_OPTS)
 	$(BZIP2_BUILD_SHARED_CMDS)
 endef