New ASN1 macros to just implement and declare the new and free functions
and changes to mkdef.pl so it recognises them.

Use these in policyMappings extension.

crypto/asn1/asn1.h

diff --git a/crypto/asn1/asn1.h b/crypto/asn1/asn1.h
index 0eb97fa..1941444 100644
--- a/crypto/asn1/asn1.h
+++ b/crypto/asn1/asn1.h
@@ -264,14 +264,15 @@
 
 #define DECLARE_ASN1_FUNCTIONS(type) DECLARE_ASN1_FUNCTIONS_name(type, type)
 
+#define DECLARE_ASN1_ALLOC_FUNCTIONS(type) \
+	DECLARE_ASN1_ALLOC_FUNCTIONS_name(type, type)
+
 #define DECLARE_ASN1_FUNCTIONS_name(type, name) \
-	type *name##_new(void); \
-	void name##_free(type *a); \
+	DECLARE_ASN1_ALLOC_FUNCTIONS_name(type, name) \
 	DECLARE_ASN1_ENCODE_FUNCTIONS(type, name, name)
 
 #define DECLARE_ASN1_FUNCTIONS_fname(type, itname, name) \
-	type *name##_new(void); \
-	void name##_free(type *a); \
+	DECLARE_ASN1_ALLOC_FUNCTIONS_name(type, name) \
 	DECLARE_ASN1_ENCODE_FUNCTIONS(type, itname, name)
 
 #define	DECLARE_ASN1_ENCODE_FUNCTIONS(type, itname, name) \
@@ -291,6 +292,9 @@
 	name *name##_new(void); \
 	void name##_free(name *a);
 
+#define DECLARE_ASN1_ALLOC_FUNCTIONS_name(type, name) \
+	type *name##_new(void); \
+	void name##_free(type *a);
 
 /* The following macros and typedefs allow an ASN1_ITEM
  * to be embedded in a structure and referenced. Since