RepositoryExternal: for libraries not built with gbuild,

such as wpd, it is necessary to depend on the package in the "use".
(for libraries built with gbuilt that is done automagically).

Change-Id: I022b66f679fe168de77c2481e6889cddbb0aac3c

RepositoryExternal.mk

@@ -1025,6 +1025,9 @@ $(eval $(call gb_Helper_register_static_libraries,PLAINLIBS, \
 ))
 
 define gb_LinkTarget__use_wpd
+$(call gb_LinkTarget_use_package,$(1),\
+	libwpd \
+)
 $(call gb_LinkTarget_use_static_libraries,$(1),\
 	wpd-0.9 \
 )