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

courgette/disassembler_win32.h

Index: courgette/disassembler_win32.h
diff --git a/courgette/disassembler_win32.h b/courgette/disassembler_win32.h
index 42dc2fef3ada8367c6871a1fdf49c9850a68c326..08d04f65634b1a035d0f545b82d5a0489af475dd 100644
--- a/courgette/disassembler_win32.h
+++ b/courgette/disassembler_win32.h
@@ -49,6 +49,8 @@ class DisassemblerWin32 : public Disassembler {
   static std::string SectionName(const Section* section);
 
  protected:
+  static bool QuickDetects(const uint8_t* start, size_t length, uint16_t magic);
+
   // Disassembler interfaces.
   RvaVisitor* CreateAbs32TargetRvaVisitor() override;
   RvaVisitor* CreateRel32TargetRvaVisitor() override;