package/erlang-jiffy: set version in jiffy.app.src

Fixes:
http://autobuild.buildroot.net/results/5c0/5c045a517ccdc97244a4cfca54465dc8d5fcc717

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Johan Oudinet <johan.oudinet@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/erlang-jiffy/erlang-jiffy.mk

@@ -11,4 +11,10 @@ ERLANG_JIFFY_LICENSE = MIT (core), \
 	BSD-3-Clause (tests)
 ERLANG_JIFFY_LICENSE_FILES = LICENSE
 
+# Set version manually in jiffy.app.src otherwise "git describe" is used.
+define ERLANG_JIFFY_SET_VERSION_HOOK
+	$(SED) 's/{vsn, git}/{vsn, "$(ERLANG_JIFFY_VERSION)"}/' $(@D)/src/jiffy.app.src
+endef
+ERLANG_JIFFY_POST_PATCH_HOOKS = ERLANG_JIFFY_SET_VERSION_HOOK
+
 $(eval $(rebar-package))