Added an input record for CAP_LENGTH.  This works with the
"gds maskhints on" option to read MiM cap length markers into
mask-hint properties in a cell.  Although reading mask-hints on
GDS input is currently experimental, adding the definition for
CAP_LENGTH is non-functional when the above option is not used,
so there's no harm in adding it.

gf180mcu/magic/gf180mcu.tech

diff --git a/gf180mcu/magic/gf180mcu.tech b/gf180mcu/magic/gf180mcu.tech
index dfcfc9e..567a07b 100644
--- a/gf180mcu/magic/gf180mcu.tech
+++ b/gf180mcu/magic/gf180mcu.tech
@@ -2451,6 +2451,8 @@
  layer mimcap CAPM
  and CAPDEF
  labels CAPM
+
+ templayer nolayer CAP_LENGTH
 #endif (MIM)
 
  # Find diffusion not covered in
@@ -2687,7 +2689,10 @@
  calma HRES 62 0
 #endif (HRPOLY1K)
  calma NAT 5 0
+#ifdef MIM
  calma CAPM 75 0
+ calma CAP_LENGTH 117 10
+#endif (MIM)
  calma DIODE  115 5
  calma CAPDEF 117 5
  calma BJTDEF 118 5