cmdutils: remove unneeded #if

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

cmdutils.h

@@ -90,9 +90,7 @@ int opt_cpuflags(void *optctx, const char *opt, const char *arg);
 
 int opt_codec_debug(void *optctx, const char *opt, const char *arg);
 
-#if CONFIG_OPENCL
 int opt_opencl(void *optctx, const char *opt, const char *arg);
-#endif
 
 /**
  * Limit the execution time.