package/lua: properly handle legacy for removed version

Commit "297613f1c7 package/lua: remove 5.2.x version" tried to add
legacy handling but the new symbols are part of a choice, and Kconfig
does not enforce the select of a option from a choice.

Update the legacy entry for 2019.02, following the example described in
the beginning of the file.

Cc: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

Config.in.legacy

@@ -2224,9 +2224,9 @@ config BR2_PACKAGE_FFTW_PRECISION_QUAD
 config BR2_PACKAGE_LUA_5_2
 	bool "Lua 5.2.x version removed"
 	select BR2_LEGACY
-	select BR2_PACKAGE_LUA_5_3
 	help
 	  The Lua 5.2.x version was removed.
+# Note: BR2_PACKAGE_LUA_5_2 is still referenced from package/lua/Config.in
 
 config BR2_TARGET_GENERIC_PASSWD_MD5
 	bool "target passwd md5 format support has been removed"

package/lua/Config.in

@@ -14,6 +14,7 @@ config BR2_PACKAGE_PROVIDES_LUAINTERPRETER
 
 choice
 	prompt "Lua Version"
+	default BR2_PACKAGE_LUA_5_3 if BR2_PACKAGE_LUA_5_2 # legacy
 	default BR2_PACKAGE_LUA_5_4
 	help
 	  Select the version of Lua API/ABI you wish to use.