libcrypto: add err_all_legacy.c to the build

It provides the ERR_load_*_strings routines, which are deprecated as of
3.0 but are used by various ports.

PR:		272580
Reviewed by:	kbowling
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D41505

secure/lib/libcrypto/Makefile

@@ -243,7 +243,7 @@ SRCS+=	eng_rdrand.c eng_table.c tb_asnmth.c tb_cipher.c tb_dh.c tb_digest.c
 SRCS+=	tb_dsa.c tb_eckey.c tb_pkmeth.c tb_rand.c tb_rsa.c
 
 # err
-SRCS+=	err.c err_all.c err_blocks.c err_prn.c
+SRCS+=	err.c err_all.c err_all_legacy.c err_blocks.c err_prn.c
 
 # ess
 SRCS+=	ess_asn1.c ess_err.c ess_lib.c