package/swupdate: disable lua in static build

Since version 2018.11 and
https://github.com/sbabic/swupdate/commit/624904cc18003fae413011563dac83a333f10509,
bindings for LUA is a shared library so disable lua if BR2_STATIC_LIBS
is set

Fixes:
 - http://autobuild.buildroot.org/results/55767e58c211656558af7916a4e0975089a2785b

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit b898b67209ff5c28f06d29b4e15ee671d6b64b0b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/swupdate/swupdate.mk

@@ -44,7 +44,7 @@ else
 SWUPDATE_MAKE_ENV += HAVE_LIBCURL=n
 endif
 
-ifeq ($(BR2_PACKAGE_HAS_LUAINTERPRETER),y)
+ifeq ($(BR2_PACKAGE_HAS_LUAINTERPRETER):$(BR2_STATIC_LIBS),y:)
 SWUPDATE_DEPENDENCIES += luainterpreter host-pkgconf
 # defines the base name for the pkg-config file ("lua" or "luajit")
 define SWUPDATE_SET_LUA_VERSION