package/cvs: use appropriate TAR

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit c6ee0ea47c1dddcafa41a00cb99790321fb60e3f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/cvs/cvs.mk

@@ -31,7 +31,7 @@ CVS_CONF_OPTS += --with-external-zlib
 endif
 
 define CVS_BZIP_UNPACK
-	$(BZCAT) $(@D)/cvs-$(CVS_VERSION).tar.bz2 | tar -C $(BUILD_DIR) $(TAR_OPTIONS) -
+	$(BZCAT) $(@D)/cvs-$(CVS_VERSION).tar.bz2 | $(TAR) -C $(BUILD_DIR) $(TAR_OPTIONS) -
 	rm -f $(@D)/cvs-$(CVS_VERSION).tar.bz2
 endef