Courgette: Add static method QuickDetect() to optimize program detection.

courgette/disassembler_elf_32.h

Index: courgette/disassembler_elf_32.h
diff --git a/courgette/disassembler_elf_32.h b/courgette/disassembler_elf_32.h
index 6bcf1b888b80cd80f3529a3f3900d3f405bee630..f0b475edc9af783739abecf33b077ec5e3f22636 100644
--- a/courgette/disassembler_elf_32.h
+++ b/courgette/disassembler_elf_32.h
@@ -94,7 +94,7 @@ class DisassemblerElf32 : public Disassembler {
   };
 
  public:
-  DisassemblerElf32(const void* start, size_t length);
+  DisassemblerElf32(const uint8_t* start, size_t length);
 
   ~DisassemblerElf32() override { }
 
@@ -121,6 +121,10 @@ class DisassemblerElf32 : public Disassembler {
   }
 
  protected:
+  static bool QuickDetect(const uint8_t* start,
+                          size_t length,
+                          e_machine_values elf_em);
+
   bool UpdateLength();
 
   // Misc Section Helpers