Add CBS_ASN1_ENUMERATED to bytestring.h.

For parsing OCSP responses.

Change-Id: I419bc60372d7927f2166bcd5bafa4147727e32ed
Reviewed-on: https://boringssl-review.googlesource.com/1670
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/include/openssl/bytestring.h b/include/openssl/bytestring.h
index 6e18499..1af20e8 100644
--- a/include/openssl/bytestring.h
+++ b/include/openssl/bytestring.h
@@ -122,6 +122,7 @@
 #define CBS_ASN1_BITSTRING 0x3
 #define CBS_ASN1_OCTETSTRING 0x4
 #define CBS_ASN1_OBJECT 0x6
+#define CBS_ASN1_ENUMERATED 0xa
 #define CBS_ASN1_SEQUENCE (0x10 | CBS_ASN1_CONSTRUCTED)
 #define CBS_ASN1_SET (0x11 | CBS_ASN1_CONSTRUCTED)