package/wsapi: update coxpcall dependency

since version 1.7, coxpcall is only required with Lua 5.1

see, https://github.com/keplerproject/wsapi/pull/41

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit b7b8a7f3ac2c32d6fde841795ac09b7b9f296219)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/wsapi/Config.in

@@ -1,6 +1,6 @@
 config BR2_PACKAGE_WSAPI
 	bool "wsapi"
-	select BR2_PACKAGE_COXPCALL # runtime
+	select BR2_PACKAGE_COXPCALL if BR2_PACKAGE_LUA_5_1 # runtime
 	select BR2_PACKAGE_LUAFILESYSTEM # runtime
 	select BR2_PACKAGE_RINGS # runtime
 	help