allow out-of-srctree builds on windows

config_host (config_$(gb_Side) dir was included from SRCDIR, but when
runing the build in another directory, it is in BUILDDIR
WinResTarget.mk was forgotten when the other references were updated in
ae4e3277 and follow-up ones.

Change-Id: I8c5a8edb4a17dd33abdcdb04c3af830cad44e07a
Reviewed-on: https://gerrit.libreoffice.org/3593Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>

solenv/gbuild/WinResTarget.mk

@@ -16,7 +16,7 @@ endef
 
 define gb_WinResTarget_WinResTarget_init
 $(call gb_WinResTarget_get_target,$(1)) : DEFS := $(gb_WinResTarget_DEFAULTDEFS)
-$(call gb_WinResTarget_get_target,$(1)) : INCLUDE := $(subst -isystem,-I,$(SOLARINC)) -I$(SRCDIR)/config_$(gb_Side)
+$(call gb_WinResTarget_get_target,$(1)) : INCLUDE := $(subst -isystem,-I,$(SOLARINC)) -I$(BUILDDIR)/config_$(gb_Side)
 $(call gb_WinResTarget_get_clean_target,$(1)) : RCFILE :=
 $(call gb_WinResTarget_get_target,$(1)) : RCFILE :=
 
@@ -24,7 +24,7 @@ $(call gb_WinResTarget_WinResTarget_platform,$(1))
 
 ifeq ($(gb_FULLDEPS),$(true))
 $(call gb_WinResTarget_get_dep_target,$(1)) : DEFS := $$(gb_WinResTarget_DEFAULTDEFS)
-$(call gb_WinResTarget_get_dep_target,$(1)) : INCLUDE := $$(gb_WinResTarget_INCLUDE) -I$(SRCDIR)/config_$(gb_Side)
+$(call gb_WinResTarget_get_dep_target,$(1)) : INCLUDE := $$(gb_WinResTarget_INCLUDE) -I$(BUILDDIR)/config_$(gb_Side)
 $(call gb_WinResTarget_get_dep_target,$(1)) : RCFILE :=
 
 -include $(call gb_WinResTarget_get_dep_target,$(1))