erlang-rebar: fix license variables

The erlang-rebar package uses ERLANG_ as the prefix for its license
variables, therefore overriding the license information from the
erlang package. This commit fixes this by using the appropriate
ERLANG_REBAR_ suffix.

Reported-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/erlang-rebar/erlang-rebar.mk

@@ -13,8 +13,8 @@ ERLANG_REBAR_SITE = $(call github,rebar,rebar,$(ERLANG_REBAR_VERSION))
 
 # Although the file LICENSE state Apache-2.0, a lot (if not all) the files
 # in src/ bear the MIT licence.
-ERLANG_LICENSE = Apache-2.0, MIT
-ERLANG_LICENSE_FILES = LICENSE
+ERLANG_REBAR_LICENSE = Apache-2.0, MIT
+ERLANG_REBAR_LICENSE_FILES = LICENSE
 
 # We do not have a target variant, so just define the dependencies,
 # configure and build commands for the host variant.