Lookup() constify call-site

plow/PlowCmd.c: Lookup() constify call-site
plot/plotVers.c: Lookup() constify call-site
plot/plotMain.c: Lookup() constify call-site
plot/plotCmd.c: Lookup() constify call-site
netmenu/NMnetlist.c: Lookup() constify call-site
netmenu/NMcmdLZ.c: Lookup() constify call-site
netmenu/NMcmdAK.c: Lookup() constify call-site
lef/lefTech.c: Lookup() constify call-site
lef/lefCmd.c: Lookup() constify call-site
irouter/irRoute.c: Lookup() constify call-site
irouter/irCommand.c: Lookup() constify call-site
router/rtrCmd.c: Lookup() constify call-site
resis/ResRex.c: Lookup() constify call-site
gcr/gcrShwFlgs.c: Lookup() constify call-site
windows/windCmdSZ.c: Lookup() constify call-site

lef/lefCmd.c

@@ -80,7 +80,8 @@ CmdLef(w, cmd)
     TxCommand *cmd;
 {
     int option, i, cargs, units = 1000;	    /* Default nanometers */
-    char **msg, *namep;
+    const char * const *msg;
+    char *namep;
     CellUse *selectedUse;
     CellDef *selectedDef;
     bool is_lef;
@@ -148,7 +149,7 @@ CmdLef(w, cmd)
 					 * sensible interpretation was possible.
 					 */
 
-    static char *cmdLefOption[] =
+    static const char * const cmdLefOption[] =
     {
 	"read [filename]		read a LEF file filename[.lef]\n"
 	"    read [filename] -import	read a LEF file; import cells from .mag files\n"
@@ -167,7 +168,7 @@ CmdLef(w, cmd)
 	NULL
     };
 
-    static char *cmdDefOption[] =
+    static const char * const cmdDefOption[] =
     {
 	"read [filename]		read a DEF file filename[.def]\n"
 	"    read [filename] -labels	read a DEF file with net labeling\n"

lef/lefTech.c

@@ -213,7 +213,7 @@ LefTechLine(sectionName, argc, argv)
     TileTypeBitMask mmask;
     lefLayer *lefl, *newlefl;
     int i, option;
-    static char *keywords[] = {
+    static const char * const keywords[] = {
 	"obstruction", "layer", "route", "routing", "masterslice",
 	"cut", "contact", "overlap", "bound", "ignore", NULL
     };