Revert "video/openvr: define OPENVR_API_NODLL"

This reverts commit 976ba1e7504f12ca08a2637380aa73e46651f7aa.

src/video/openvr/SDL_openvrvideo.h

@@ -13,7 +13,6 @@
 #pragma GCC diagnostic ignored "-Wunused-variable"
 #endif
 
-#define OPENVR_API_NODLL
 #define USE_SDL
 #include "openvr_capi.h"