Corrected one of the entries just added for ignoring unused layer:
purpose pairs in magic.

sky130/magic/sky130.tech

diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 65892c3..121c5ca 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -2377,7 +2377,6 @@
 #ifndef METAL5
  ignore MET4,VIA3
  ignore MET5,VIA4
- ignore MET5BLOCK
 #endif
  ignore NPC
  ignore SEALID
@@ -2387,6 +2386,7 @@
  ignore POLYMOD
  ignore LOWTAPDENSITY
  ignore FILLOBSPOLY
+ ignore MET5BLOCK
  ignore OUTLINE
  ignore POLYCUT
  ignore POLYGATE