Removed the rndiff, rpdiff spacing to contact rules, which do not
exist in the PDK (required distance is zero; i.e., no overlap, which
is enforced by the definition of the magic tile types).
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 5cf453d..cf09405 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -5313,8 +5313,6 @@
 	"Diffusion contact to standard cell gate < %d (licon.11)"
  spacing mvndc,mvpdc mvnfet,mvnnfet,mvpfet 55 touching_illegal \
 	"Diffusion contact to gate < %d (licon.11)"
- spacing ndc,mvndc rnd,mvrnd 60 touching_illegal "Diffusion contact to rndiff < %d ()"
- spacing pdc,mvpdc rdp,mvrdp 60 touching_illegal "Diffusion contact to rndiff < %d ()"
  spacing nsc varactor,varhvt 250 touching_illegal \
 	"Diffusion contact to varactor gate < %d (licon.10)"
  spacing mvnsc mvvar 250 touching_illegal \