Clean up gb_Library_set_componentfile argument handling.

It is only ever called with 2, never with 3 arguments.  And the
gb_ComponentTarget_ComponentTarget it calls only takes 3, not 4 arguments.

solenv/gbuild/Library.mk

@@ -78,8 +78,8 @@ $(call gb_Deliver_add_deliverable,$(call gb_Library_get_target,$(1)),$(call gb_L
 endef
 
 define gb_Library_set_componentfile
-$(call gb_ComponentTarget_ComponentTarget,$(or $(strip $(3)),$(strip $(2))),$(call gb_Library__get_componentprefix,$(1)),\
-	$(call gb_Library_get_runtime_filename,$(if $(MERGELIBS),$(if $(filter $(gb_MERGED_LIBS),$(1)),merged,$(1)),$(1))),$(2))
+$(call gb_ComponentTarget_ComponentTarget,$(2),$(call gb_Library__get_componentprefix,$(1)),\
+	$(call gb_Library_get_runtime_filename,$(if $(MERGELIBS),$(if $(filter $(gb_MERGED_LIBS),$(1)),merged,$(1)),$(1))))
 $(call gb_LinkTarget_get_target,$(call gb_Library_get_linktargetname,$(1))) : \
 	$(call gb_ComponentTarget_get_outdir_target,$(2))
 $(call gb_Library_get_clean_target,$(1)) : $(call gb_ComponentTarget_get_clean_target,$(or $(strip $(3)),$(strip $(2))))