include: Fix an enum definition that was actually defining a variable.
diff --git a/include/cvconst.h b/include/cvconst.h
index 2b1cdf5..86dd3f1 100644
--- a/include/cvconst.h
+++ b/include/cvconst.h
@@ -528,7 +528,7 @@
     CV_AMD64_R13        = 341,
     CV_AMD64_R14        = 342,
     CV_AMD64_R15        = 343,
-} CV_HREG_e;
+};
 
 typedef enum
 {