Move some work out of the makefiles and into awk scripts in separate files.

Ticket #940. (CVS 2005)

FossilOrigin-Name: 4d0f29d54c0ccb153abd77d9b62b6461ec1e978f

mkopcodeh.awk

@@ -34,6 +34,8 @@
 # Assign numbers to all opcodes and output the result.
 END {
   cnt = 0
+  print "/* Automatically generated.  Do not edit */"
+  print "/* See the mkopcodeh.awk script for details */"
   for(name in op){
     if( op[name]<0 ){
       cnt++