Fix compilation on linux

Closes tgoyne/aegisub#4.

libaegisub/include/libaegisub/option_value.h

@@ -23,6 +23,9 @@
 #include <libaegisub/exception.h>
 #include <libaegisub/signal.h>
 
+// X11 is awesome and defines Bool to int
+#undef Bool
+
 namespace agi {
 DEFINE_BASE_EXCEPTION_NOINNER(OptionValueError, Exception)
 DEFINE_SIMPLE_EXCEPTION_NOINNER(OptionValueErrorInvalidType, OptionValueError, "options/invalid_type")

src/preferences_base.cpp

@@ -42,6 +42,8 @@
 #include <wx/stattext.h>
 #include <wx/treebook.h>
 
+#undef Bool
+
 #define OPTION_UPDATER(type, evttype, opt, body)                            \
 	class type {                                                            \
 		std::string name;                                                   \