Make Library_sdfilt find Library_sd include files via -I

...instead of through ../../... paths.  Change done in preparation of
loplugin:includeform.

Change-Id: I1b4476f32573c2ef19d2a145e6e617b63006d40b
Reviewed-on: https://gerrit.libreoffice.org/43562Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

sd/Library_sdfilt.mk

@@ -12,6 +12,7 @@ $(eval $(call gb_Library_Library,sdfilt))
 $(eval $(call gb_Library_set_include,sdfilt,\
     $$(INCLUDE) \
     -I$(SRCDIR)/sd/inc \
+    -I$(SRCDIR)/sd/source/ui/inc \
 ))
 
 ifneq ($(strip $(dbg_anim_log)$(DBG_ANIM_LOG)),)

sd/source/filter/ppt/pptin.cxx

@@ -74,9 +74,9 @@
 #include "customshowlist.hxx"
 #include "sddll.hxx"
 
-#include "../../ui/inc/DrawDocShell.hxx"
-#include "../../ui/inc/FrameView.hxx"
-#include "../../ui/inc/optsitem.hxx"
+#include "DrawDocShell.hxx"
+#include "FrameView.hxx"
+#include "optsitem.hxx"
 
 #include <unotools/fltrcfg.hxx>
 #include <sfx2/progress.hxx>