package/lua-cffi: add luajit support

luajit is supported since the addition of the package in commit
13114d0f9352531e5d7ebed45cd3f679407c61d9 and
https://github.com/q66/cffi-lua/commit/cb92c44e781d81e31eb7fe21911b01e54a2c3893

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Peter: append to LUA_CFFI_CONF_OPTS]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/lua-cffi/Config.in

@@ -1,6 +1,5 @@
 config BR2_PACKAGE_LUA_CFFI
 	bool "lua-cffi"
-	depends on !BR2_PACKAGE_LUAJIT
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libffi
 	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
 	depends on BR2_INSTALL_LIBSTDCPP
@@ -13,7 +12,6 @@ config BR2_PACKAGE_LUA_CFFI
 	  https://github.com/q66/cffi-lua
 
 comment "lua-cffi needs a toolchain w/ C++, gcc >= 4.8, threads"
-	depends on !BR2_PACKAGE_LUAJIT
 	depends on !BR2_INSTALL_LIBSTDCPP || \
 		!BR2_TOOLCHAIN_GCC_AT_LEAST_4_8 || \
 		!BR2_TOOLCHAIN_HAS_THREADS

package/lua-cffi/lua-cffi.mk

@@ -9,6 +9,14 @@ LUA_CFFI_SITE = $(call github,q66,cffi-lua,v$(LUA_CFFI_VERSION))
 LUA_CFFI_LICENSE = MIT
 LUA_CFFI_LICENSE_FILES = COPYING.md
 
-LUA_CFFI_DEPENDENCIES = libffi lua
+LUA_CFFI_DEPENDENCIES = libffi
+
+ifeq ($(BR2_PACKAGE_LUA),y)
+LUA_CFFI_DEPENDENCIES += lua
+LUA_CFFI_CONF_OPTS += -Dlua_version=$(LUAINTERPRETER_ABIVER)
+else ifeq ($(BR2_PACKAGE_LUAJIT),y)
+LUA_CFFI_DEPENDENCIES += luajit
+LUA_CFFI_CONF_OPTS += -Dlua_version=luajit
+endif
 
 $(eval $(meson-package))