Initial port to Linux (using Allegro).

64-bit fixes.
Some changes to aid portability.
A few other tweaks.

src/allegro-mouse.c

@@ -0,0 +1,31 @@
+#include "allegro-main.h"
+#include "plat-mouse.h"
+
+int mouse_buttons;
+
+void mouse_init()
+{
+        install_mouse();
+}
+
+void mouse_close()
+{
+}
+
+void mouse_poll_host()
+{
+        //poll_mouse();
+	mouse_buttons = mouse_b;
+}
+
+void mouse_get_mickeys(int *x, int *y)
+{
+	if (mousecapture)
+	{
+	        get_mouse_mickeys(x, y);
+//        	position_mouse(64, 64);
+	}
+	else
+	        *x = *y = 0;
+}
+