compilation errors on master

[Cristian Ionescu-Idbohrn]

`git describe' says V_7_3_P1-207-gc924b2ef (shouldn't it say 
V_7_4_P1-<yadayada>?).  This is what I see:

gcc -g -O2 -Wall -Wpointer-arith -Wuninitialized -Wsign-compare -Wformat-security -Wsizeof-pointer-memaccess -Wno-pointer-sign -Wno-unused-result -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -ftrapv -fno-builtin-memset -fstack-protector-strong -fPIE  -I. -I.  -DSSHDIR=\"/usr/local/etc\" -D_PATH_SSH_PROGRAM=\"/usr/local/bin/ssh\" -D_PATH_SSH_ASKPASS_DEFAULT=\"/usr/local/libexec/ssh-askpass\" -D_PATH_SFTP_SERVER=\"/usr/local/libexec/sftp-server\" -D_PATH_SSH_KEY_SIGN=\"/usr/local/libexec/ssh-keysign\" -D_PATH_SSH_PKCS11_HELPER=\"/usr/local/libexec/ssh-pkcs11-helper\" -D_PATH_SSH_PIDDIR=\"/var/run\" -D_PATH_PRIVSEP_CHROOT_DIR=\"/var/empty\" -DHAVE_CONFIG_H -c sshkey.c -o sshkey.o
sshkey.c: In function ‘sshkey_size’:
sshkey.c:274:28: error: dereferencing pointer to incomplete type ‘RSA {aka struct rsa_st}’
   return BN_num_bits(k->rsa->n);
                            ^~
sshkey.c:277:28: error: dereferencing pointer to incomplete type ‘DSA {aka struct dsa_st}’
   return BN_num_bits(k->dsa->p);
                            ^~
sshkey.c: In function ‘sshkey_new’:
sshkey.c:478:11: error: dereferencing pointer to incomplete type ‘RSA {aka struct rsa_st}’
       (rsa->n = BN_new()) == NULL ||
           ^~
sshkey.c:490:11: error: dereferencing pointer to incomplete type ‘DSA {aka struct dsa_st}’
       (dsa->p = BN_new()) == NULL ||
           ^~
sshkey.c: In function ‘sshkey_parse_private_pem_fileblob’:
sshkey.c:3792:8: error: dereferencing pointer to incomplete type ‘EVP_PKEY {aka struct evp_pkey_st}’
  if (pk->type == EVP_PKEY_RSA &&
        ^~


Cheers,

-- 
Cristian