OpenBSD 7.5 build fails because EVP_add_cipher_alias() no longer exists in OpenBSD libcrypto

[infrastation]

$ make -s CFLAGS=-Werror
print-esp.c: In function 'esp_init':
print-esp.c:681:9: error: implicit declaration of function 'EVP_add_cipher_alias' [-Werror=implicit-function-declaration]
  681 |         EVP_add_cipher_alias(SN_des_ede3_cbc, "3des");
      |         ^~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
*** Error 1 in /home/buildbot-worker/openbsd-amd64/tmpfs/tcpdump-openbsd-amd64/build (Makefile:68 'print-esp.o': egcc -W -Wall -Wcast-qual -...)
*** Error 1 in target 'print-esp.o'

In OpenBSD 7.4 the header defines EVP_add_cipher_alias() as follows:

#define EVP_add_cipher_alias(n,alias) \
        OBJ_NAME_add((alias),OBJ_NAME_TYPE_CIPHER_METH|OBJ_NAME_ALIAS,(n))

In OpenBSD 7.5 it does not define the macro since revision 1.122 (2024-03-02). One way to resolve this would be to make the alias conditional, another would be to stop using it (it was introduced in commit 0d821a5).

[infrastation]

Using MATRIX_CRYPTO=no masks this problem meanwhile.