Revert "Add a --enable-lua switch to enable LUA support"

This reverts commit 82d4832013.

This just makes the code unreadable and why would one build
without lua :-)

src/gui/plugins.h

@@ -51,12 +51,8 @@ class CPlugins
 		P_TYPE_DISABLED = 0x1,
 		P_TYPE_GAME     = 0x2,
 		P_TYPE_TOOL     = 0x4,
-		P_TYPE_SCRIPT   = 0x8
-
-#if ENABLE_LUA
-		,
+		P_TYPE_SCRIPT   = 0x8,
 		P_TYPE_LUA      = 0x10
-#endif
 	}
 	p_type_t;
 
@@ -127,9 +123,8 @@ class CPlugins
 		void startPlugin(int number,int param);
 		void start_plugin_by_name(const std::string & filename,int param);// start plugins by "name=" in .cfg
 		void startScriptPlugin(int number);
-#if ENABLE_LUA
 		void startLuaPlugin(int number);
-#endif
+
 		void startPlugin(const char * const filename); // start plugins also by name
 		bool hasPlugin(CPlugins::p_type_t type);