Fixed building with libusb not dynamicaly loaded

(cherry-picked from commit 3f89d1704d)
(cherry-picked from commit 4ebf34857a)
(cherry-picked from commit 5767dc710e)
(cherry-picked from commit 9d77945d36)
(cherry-picked from commit 2847696338)

include/SDL_config_os2.h

@@ -43,6 +43,7 @@
 /*#undef SDL_JOYSTICK_HIDAPI */
 #else
 #define SDL_JOYSTICK_HIDAPI 1
+#define HAVE_LIBUSB 1
 /* dynamically loaded libusb-1.0 dll: */
 #define SDL_LIBUSB_DYNAMIC "usb100.dll"
 #endif