Get `gn gen` to succeed on Windows

third_party/sqlite/src/mkopcodec.awk

+#!/usr/bin/awk -f
+#
+# This AWK script scans the opcodes.h file (which is itself generated by
+# another awk script) and uses the information gleaned to create the
+# opcodes.c source file.
+#
+# Opcodes.c contains strings which are the symbolic names for the various
+# opcodes used by the VDBE.  These strings are used when disassembling a
+# VDBE program during tracing or as a result of the EXPLAIN keyword.
+#
+BEGIN {
+  print "/* Automatically generated.  Do not edit */"
+  print "/* See the mkopcodec.awk script for details. */"
+  printf "#if !defined(SQLITE_OMIT_EXPLAIN)"
+  printf    " || !defined(NDEBUG)"
+  printf    " || defined(VDBE_PROFILE)"
+  print     " || defined(SQLITE_DEBUG)"
+  print "const char *sqlite3OpcodeName(int i){"
+  print " static const char *const azName[] = { \"?\","
+}
+/define OP_/ {
+  sub("OP_","",$2)
+  i++
+  printf "     /* %3d */ \"%s\",\n", $3, $2
+}
+END {
+  print "  };"
+  print "  return azName[i];"
+  print "}"
+  print "#endif"
+}