nangate45: use original LEF to restore antenna info

Switch to NangateOpenCellLibrary.macro.lef which has antenna data
and remove the obsolete .mod.lef and .rect.lef files. Fixes #597

Signed-off-by: alokkumardalei-wq <alokkumardalei2@gmail.com>

Author: alokkumardalei-wq

flow/platforms/nangate45/config.mk

@@ -5,7 +5,7 @@ export PROCESS = 45
 # Tech/Libs
 # ----------------------------------------------------
 export TECH_LEF = $(PLATFORM_DIR)/lef/NangateOpenCellLibrary.tech.lef
-export SC_LEF = $(PLATFORM_DIR)/lef/NangateOpenCellLibrary.macro.mod.lef
+export SC_LEF = $(PLATFORM_DIR)/lef/NangateOpenCellLibrary.macro.lef
 
 export LIB_FILES = $(PLATFORM_DIR)/lib/NangateOpenCellLibrary_typical.lib \
                      $(ADDITIONAL_LIBS)

flow/platforms/nangate45/lef/NangateOpenCellLibrary.macro.lef

@@ -9630,6 +9630,36 @@ MACRO XOR2_X2
   END
 END XOR2_X2
 
+MACRO TAPCELL_X1
+  #CLASS CORE ;
+  CLASS CORE WELLTAP ;
+  ORIGIN 0 0 ;
+  FOREIGN TAPCELL_X1 0 0 ;
+  SIZE 0.19 BY 1.4 ;
+  SYMMETRY X Y ;
+  SITE FreePDK45_38x28_10R_NP_162NW_34O ;
+  PIN VDD
+    DIRECTION INOUT ;
+    USE POWER ;
+    SHAPE ABUTMENT ;
+    PORT
+      LAYER metal1 ;
+        RECT 0 1.315 0.19 1.485 ;
+        RECT 0.06 0.975 0.13 1.315 ;
+    END
+  END VDD
+  PIN VSS
+    DIRECTION INOUT ;
+    USE GROUND ;
+    SHAPE ABUTMENT ;
+    PORT
+      LAYER metal1 ;
+        RECT 0 -0.085 0.19 0.085 ;
+        RECT 0.06 0.085 0.13 0.425 ;
+    END
+  END VSS
+END TAPCELL_X1
+
 END LIBRARY
 #
 # End of file