smoketest: fix build with MSVC:

Linking an empty CppunitTest against smoketest Library does not work,
the linker complains aboutunresolved external symbol DllMainCRTstartup
or something like that; building a static library has the same result;
so just build the cxx file twice via a dummy smoketest_too.cxx.

Change-Id: I11a29d4ec134f67a7de896ff8c669ed5b47782a7

smoketest/CppunitTest_smoketest.mk

@@ -29,13 +29,20 @@ $(eval $(call gb_CppunitTest_CppunitTest,smoketest))
 
 $(eval $(call gb_CppunitTest_abort_on_assertion,smoketest))
 
+$(eval $(call gb_CppunitTest_add_exception_objects,smoketest,\
+	smoketest/smoketest_too \
+))
+
 $(eval $(call gb_CppunitTest_use_api,smoketest,\
 	offapi \
 	udkapi \
 ))
 
 $(eval $(call gb_CppunitTest_use_libraries,smoketest,\
-	smoketest \
+	cppu \
+	cppuhelper \
+	sal \
+	unotest \
 ))
 
 ifeq ($(OS),MACOSX)

smoketest/smoketest_too.cxx

+#include <smoketest.cxx>