See if it's always defined this way

gfx/drivers_renderchain/gl2_renderchain.c

@@ -70,7 +70,7 @@ typedef struct gl2_renderchain
 
    unsigned fence_count;
 
-   void *fences[MAX_FENCES];
+   GLsync fences[MAX_FENCES];
 
    struct gfx_fbo_scale fbo_scale[GFX_MAX_SHADERS];
 } gl2_renderchain_t;

gfx/include/GL/glext.h

@@ -6220,8 +6220,8 @@ typedef uint64_t GLuint64EXT;
 #ifndef GL_ARB_sync
 typedef int64_t GLint64;
 typedef uint64_t GLuint64;
-typedef struct __GLsync *GLsync;
 #endif
+typedef struct __GLsync *GLsync;
 
 #ifndef GL_ARB_cl_event
 /* These incomplete types let us declare types compatible with OpenCL's cl_context and cl_event */