gbuild: add gb_Jar_use_external_jar

... which is an ugly hack to handle jar files that are from externals
and are not bundled in the main instset, only in extensions.

Change-Id: I992242b7c990c24318b040e98b6632e3b78b6f63

RepositoryExternal.mk

@@ -2820,21 +2820,21 @@ $(eval $(call gb_Helper_register_jars,OXT,\
 ))
 
 define gb_Jar__use_commons-codec
-$(call gb_Jar_use_jar,$(1),commons-codec-1.6)
+$(call gb_Jar_use_external_jar,$(1),$(OUTDIR)/bin/commons-codec-1.6.jar)
 endef
 define gb_ExternalProject__use_commons-codec
 $(call gb_ExternalProject_use_external_project,$(1),apache_commons_codec)
 endef
 
 define gb_Jar__use_commons-httpclient
-$(call gb_Jar_use_jar,$(1),commons-httpclient-3.1)
+$(call gb_Jar_use_external_jar,$(1),$(OUTDIR)/bin/commons-httpclient-3.1.jar)
 endef
 define gb_ExternalProject__use_commons-httpclient
 $(call gb_ExternalProject_use_external_project,$(1),apache_commons_httpclient)
 endef
 
 define gb_Jar__use_commons-lang
-$(call gb_Jar_use_jar,$(1),commons-lang-2.4)
+$(call gb_Jar_use_external_jar,$(1),$(OUTDIR)/bin/commons-lang-2.4.jar)
 endef
 define gb_ExternalProject__use_commons-lang
 $(call gb_ExternalProject_use_external_project,$(1),apache_commons_lang)

solenv/gbuild/Jar.mk

@@ -217,6 +217,13 @@ $(call gb_Jar_add_manifest_classpath,$(1),$(call gb_Helper_make_url,$(2)))
 
 endef
 
+define gb_Jar_use_external_jar
+$(call gb_JavaClassSet_use_system_jar,$(call gb_Jar_get_classsetname,$(1)),$(2))
+$(call gb_Jar_add_manifest_classpath,$(1),$(notdir $(2)))
+$(call gb_Jar_get_target,$(1)) : $(2)
+
+endef
+
 define gb_Jar_add_jars
 $$(call gb_Output_error,\
  gb_Jar_add_jars: use gb_Jar_use_jars instead.)