Add ragel machine generators to SCONS

src/trusted/validator_ragel/unreviewed/gen-dfa.cc

Index: src/trusted/validator_ragel/unreviewed/gen-dfa.cc
===================================================================
--- src/trusted/validator_ragel/unreviewed/gen-dfa.cc	(revision 8157)
+++ src/trusted/validator_ragel/unreviewed/gen-dfa.cc	(working copy)
@@ -189,7 +189,7 @@
 
   class Instruction {
    public:
-    static bool check_flag_valid(const std::string &flag) {
+    static void check_flag_valid(const std::string &flag) {
       if (all_instruction_flags.find(flag) == all_instruction_flags.end()) {
         fprintf(stderr, "%s: unknown flag: '%s'\n",
                 short_program_name, flag.c_str());
@@ -1189,7 +1189,7 @@
     explicit MarkedInstruction(Instruction instruction_) :
         Instruction(instruction_),
         instruction_class(get_instruction_class(instruction_)),
-        opcode_in_modrm(false), opcode_in_imm(false), rex { } {
+        rex { }, opcode_in_modrm(false), opcode_in_imm(false) {
       if (has_flag("branch_hint")) {
         optional_prefixes.insert("branch_hint");
       }
@@ -1548,7 +1548,7 @@
       }
       bool modrm_memory = false;
       bool modrm_register = false;
-      char operand_source;
+      char operand_source = ' ';
       for (auto operand_it = operands.begin();
            operand_it != operands.end(); ++operand_it) {
         auto &operand = *operand_it;