fix spurious re-delivery of RDB files:

The OUTDIR RDB depends on Packages for IDL and headers, the latter of
which depends on the WORKDIR RDB, hence preserving timestamps here leads
to spurious re-delivery because the OUTDIR RDB always has older
timestamp than the headers Package.

solenv/gbuild/UnoApi.mk

@@ -30,6 +30,14 @@ $(call gb_UnoApi_get_clean_target,%) :
 	$(call gb_Helper_abbreviate_dirs,\
 		rm -f $(call gb_UnoApi_get_target,$*))
 
+# override the rule from Package.mk:44:
+# preserving timestamps is not desirable here, because the OUTDIR target
+# depends on package targets _inc and _idl, and those depend on the WORKDIR
+# target, so with timestamps preserved the RDB always gets delivered again
+$(call gb_UnoApi_get_target,%) : $(call gb_UnoApiTarget_get_target,%)
+	$(gb_Deliver_GNUCOPY) $(if $(gb_Deliver_CLEARONDELIVER),--remove-destination) --no-dereference --force $< $@
+
+
 define gb_UnoApi_UnoApi
 $(call gb_UnoApiTarget_UnoApiTarget,$(1))
 $(call gb_UnoApiHeadersTarget_UnoApiHeadersTarget,$(1))

solenv/gbuild/gbuild.mk

@@ -285,6 +285,7 @@ include $(SOLARENV)/inc/minor.mk
 # For example:
 # $(OUTDIR)/bin/% for executables collides
 #	with $(OUTDIR)/bin/%.res for resources on unix
+#	with $(OUTDIR)/bin/%.rdb for UnoApi
 # $(OUTDIR)/lib/%.lib collides
 #	on windows (static and dynamic libs)
 # $(OUTDIR)/xml/% for packageparts collides
@@ -303,6 +304,7 @@ include $(foreach class, \
 	StaticLibrary \
 	Executable \
 	SdiTarget \
+	UnoApi \
 	Package \
 	CustomTarget \
 	ExternalLib \
@@ -315,7 +317,6 @@ include $(foreach class, \
 	JunitTest \
 	Module \
 	UnoApiTarget \
-	UnoApi \
 	UnoApiMerge \
 	InternalUnoApi \
 	Zip \