Remove obsolete function, struct, and macro names

Remove obsolete function, struct, and macro names
that tb@ removed from asn1.h on January 14:

rev. 1.58: ASN1_CTX ASN1_const_CTX
rev. 1.60: ASN1_OBJECT_FLAG_CRITICAL ASN1_OBJECT_FLAG_DYNAMIC
rev. 1.60: ASN1_OBJECT_FLAG_DYNAMIC_DATA ASN1_OBJECT_FLAG_DYNAMIC_STRINGS
rev. 1.61: NETSCAPE_X509 NETSCAPE_X509_free NETSCAPE_X509_new
rev. 1.61: d2i_NETSCAPE_X509 i2d_NETSCAPE_X509