CppunitTest_desktop_lib: avoid #include "../..." style include

Change-Id: Ib5ce0dee00c9306f89ad4b43af4b34e604147a1c

desktop/CppunitTest_desktop_lib.mk

@@ -36,6 +36,11 @@ $(eval $(call gb_CppunitTest_use_externals,desktop_lib, \
     cairo \
 ))
 
+$(eval $(call gb_CppunitTest_set_include,desktop_lib,\
+    -I$(SRCDIR)/desktop/inc \
+    $$(INCLUDE) \
+))
+
 $(eval $(call gb_CppunitTest_use_api,desktop_lib,\
 	offapi \
 	udkapi \

desktop/qa/desktop_lib/test_desktop_lib.cxx

@@ -31,7 +31,7 @@
 #include <unotools/tempfile.hxx>
 #include <cairo.h>
 
-#include "../../inc/lib/init.hxx"
+#include <lib/init.hxx>
 
 using namespace com::sun::star;
 using namespace desktop;