Added "mask-hints" output capability for layers LVTN and HVTP, which
are used in standard cells.

sky130/magic/sky130.tech

diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 9e88d0a..de86ffd 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -836,6 +836,7 @@
 	grow	185
 	shrink	185
 	close  265000
+	mask-hints LVTN
 	calma 125 44
 
 #----------------------------------------------------------------
@@ -860,6 +861,7 @@
 	grow	185
 	shrink	185
 	close 265000
+	mask-hints HVTP
 	calma 78 44
 
 #----------------------------------------------------------------