Add gb_CppunitTest_use_confpreinit:

For unit tests that use the VCL event loop we can use this to
avoid the otherwise required restart.

Change-Id: I48265d7e7188a4efaa6f87432c762320331c0c78

solenv/gbuild/CppunitTest.mk

@@ -82,6 +82,8 @@ $(call gb_CppunitTest_get_target,%) :| $(gb_CppunitTest_CPPTESTDEPS)
 	$(call gb_Helper_abbreviate_dirs,\
 		mkdir -p $(dir $@) && \
 		rm -fr $@.user && mkdir $@.user && \
+		$(if $(gb_CppunitTest__use_confpreinit), \
+		    $(INSTDIR)/program/lokconf_init $(call gb_CppunitTest__make_args) &&) \
 		$(if $(gb_CppunitTest__interactive),, \
 			$(if $(value gb_CppunitTest_postprocess), \
 				rm -fr $@.core && mkdir $@.core && cd $@.core &&)) \
@@ -177,6 +179,12 @@ endif
 
 endef
 
+define gb_CppunitTest_use_confpreinit
+$(call gb_CppunitTest_use_executable,$(1),lokconf_init)
+$(call gb_CppunitTest_get_target,$(1)) : gb_CppunitTest__use_confpreinit := TRUE
+
+endef
+
 define gb_CppunitTest_use_vcl
 $(call gb_CppunitTest__use_vcl,$(1),$(true))