wined3d: Implement WINED3DSIH_UTOF in the GLSL shader backend.

dlls/wined3d/glsl_shader.c

@@ -5383,7 +5383,7 @@ static const SHADER_HANDLER shader_glsl_instruction_handler_table[WINED3DSIH_TAB
     /* WINED3DSIH_TEXREG2RGB            */ shader_glsl_texreg2rgb,
     /* WINED3DSIH_UDIV                  */ NULL,
     /* WINED3DSIH_USHR                  */ NULL,
-    /* WINED3DSIH_UTOF                  */ NULL,
+    /* WINED3DSIH_UTOF                  */ shader_glsl_to_float,
     /* WINED3DSIH_XOR                   */ shader_glsl_binop,
 };