Modified the techfile to make use of a techfile extension added to
magic that allows the paint/erase lines in "compose" to declare
multiple types to be painted.  This allows the "obslic" contact to
be erased if painted over with obsm1 without erasing obsli underneath.
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index ba6808e..d4e19de 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -609,8 +609,7 @@
   compose  mvvar   poly  mvnsd
 
   paint	 obslic	 locali	 via1
-  paint	 obslic	 obsm1	 obsm1
-  paint	 obslic	 obsm1	 obsli
+  paint	 obslic	 obsm1	 obsli,obsm1
   
   paint  ndc     nwell  pdc
   paint  nfet    nwell  pfet