Remove ASN.1 print hooks.

These functions are never instantiated. (They're a remnant of the PKCS#7 and
CMS bits.) Next time upstream touches this code, we don't have to puzzle
through the diff and import it.

Change-Id: I67c2102ae13e8e0527d858e1c63637dd442a4ffb
Reviewed-on: https://boringssl-review.googlesource.com/8242
Reviewed-by: David Benjamin <davidben@google.com>

include/openssl/asn1t.h

diff --git a/include/openssl/asn1t.h b/include/openssl/asn1t.h
index b43c332..10d32c4 100644
--- a/include/openssl/asn1t.h
+++ b/include/openssl/asn1t.h
@@ -631,6 +631,7 @@
 	ASN1_ex_free_func *asn1_ex_clear;
 	ASN1_ex_d2i *asn1_ex_d2i;
 	ASN1_ex_i2d *asn1_ex_i2d;
+	/* asn1_ex_print is unused. */
 	ASN1_ex_print_func *asn1_ex_print;
 } ASN1_EXTERN_FUNCS;
 
@@ -835,17 +836,6 @@
         return ASN1_item_dup(ASN1_ITEM_rptr(stname), x); \
         }
 
-#define IMPLEMENT_ASN1_PRINT_FUNCTION(stname) \
-	IMPLEMENT_ASN1_PRINT_FUNCTION_fname(stname, stname, stname)
-
-#define IMPLEMENT_ASN1_PRINT_FUNCTION_fname(stname, itname, fname) \
-	int fname##_print_ctx(BIO *out, stname *x, int indent, \
-						const ASN1_PCTX *pctx) \
-	{ \
-		return ASN1_item_print(out, (ASN1_VALUE *)x, indent, \
-			ASN1_ITEM_rptr(itname), pctx); \
-	} 
-
 #define IMPLEMENT_ASN1_FUNCTIONS_const(name) \
 		IMPLEMENT_ASN1_FUNCTIONS_const_fname(name, name, name)