libcrypto: link engines and the legacy provider to libcrypto

OpenSSL's legacy provider module and engines need to link to
libcrypto.so, as it provides some of the actual implementations of
legacy routines.

This is a little tricky due to build order issues.  Introduce a small
hack (LIBCRYPTO_WITHOUT_SUBDIRS) that builds libcrypto.so in its usual
early phase without any OpenSSL provider modules or engines.  This is
intended to restore the test suite; a future change should remove the
hack and replace it with a better approach.

PR:		254853, 273528
Discussed with:	Folks at EuroBSDCon in Coimbra
Sponsored by:	The FreeBSD Foundation

Makefile.inc1

@@ -2980,7 +2980,7 @@ libraries: .MAKE .PHONY
 	${_+_}cd ${.CURDIR}; \
 	    ${MAKE} -f Makefile.inc1 _prereq_libs; \
 	    ${MAKE} -f Makefile.inc1 _startup_libs; \
-	    ${MAKE} -f Makefile.inc1 _prebuild_libs; \
+	    ${MAKE} -f Makefile.inc1 _prebuild_libs -DLIBCRYPTO_WITHOUT_SUBDIRS; \
 	    ${MAKE} -f Makefile.inc1 _generic_libs
 
 #

secure/lib/libcrypto/Makefile

@@ -1,6 +1,8 @@
 
 SHLIBDIR?=	/lib
+.if !defined(LIBCRYPTO_WITHOUT_SUBDIRS)
 SUBDIR=		engines modules
+.endif
 
 .include <bsd.own.mk>
 .include <src.opts.mk>

secure/lib/libcrypto/engines/Makefile.inc

@@ -16,6 +16,8 @@ CFLAGS+=	-DB_ENDIAN
 .endif
 CFLAGS+=	-DNDEBUG
 
+LIBADD=		crypto
+
 .PATH: ${LCRYPTO_SRC}/engines
 
 WARNS?=		0

secure/lib/libcrypto/modules/legacy/Makefile

@@ -1,5 +1,6 @@
 
 SHLIB_NAME?=	legacy.so
+LIBADD=		crypto
 
 SRCS+=	legacyprov.c prov_running.c