Ignore and distclean generated files

(Modelling .gitignore-per-directory instead of a single one in the root dir
after exisiting config/.gitignore.  No idea which approach is better.)

Change-Id: I0ae90103ada4bfff48e90afcf3903bd3ba909314

Makefile.in

@@ -194,6 +194,8 @@ endif
         $(BUILDDIR)/config_host.mk.last \
         $(BUILDDIR)/config_host.mk.stamp \
         $(BUILDDIR)/configure \
+        $(BUILDDIR)/instsetoo_native/util/openoffice.lst \
+        $(BUILDDIR)/solenv/inc/minor.mk \
         $(BUILDDIR)/warn
 	find $(SOLARENV)/gdb -name "*.pyc" -exec rm {} \;
 

instsetoo_native/util/.gitignore

+/openoffice.lst

solenv/inc/.gitignore

+/minor.mk
\ No newline at end of file