Add native support for zstd to libarchive

Note that old pkg will failed to build after this. A recent ports tree (one
providing pkg 1.12+) is required to build. Older already built pkg, should
continue working as expected

PR:		238797
Exp run by:	antoine
Reviewed by:	cem
Approved by:	cem
Differential Revision:	https://reviews.freebsd.org/D20752

Makefile.inc1

@@ -2770,6 +2770,7 @@ _prebuild_libs=	${_kerberos5_lib_libasn1} \
 		lib/libfigpar \
 		${_lib_libgssapi} \
 		lib/libkiconv lib/libkvm lib/liblzma lib/libmd lib/libnv \
+		lib/libzstd \
 		${_lib_casper} \
 		lib/ncurses/ncurses lib/ncurses/ncursesw \
 		lib/libopie lib/libpam/libpam ${_lib_libthr} \

lib/Makefile

@@ -102,7 +102,7 @@ SUBDIR=	${SUBDIR_BOOTSTRAP} \
 # libraries, those libraries should be listed as build order dependencies here.
 
 SUBDIR_DEPEND_geom=	libufs
-SUBDIR_DEPEND_libarchive= libz libbz2 libexpat liblzma libmd
+SUBDIR_DEPEND_libarchive= libz libbz2 libexpat liblzma libmd libzstd
 SUBDIR_DEPEND_libauditdm= libbsm
 SUBDIR_DEPEND_libbsnmp= ${_libnetgraph}
 SUBDIR_DEPEND_libc++:= libcxxrt

lib/libarchive/Makefile

@@ -6,8 +6,8 @@ _LIBARCHIVEDIR=	${SRCTOP}/contrib/libarchive
 
 LIB=	archive
 
-LIBADD=	z bz2 lzma bsdxml
-CFLAGS+= -DHAVE_BZLIB_H=1 -DHAVE_LIBLZMA=1 -DHAVE_LZMA_H=1
+LIBADD=	z bz2 lzma bsdxml zstd
+CFLAGS+= -DHAVE_BZLIB_H=1 -DHAVE_LIBLZMA=1 -DHAVE_LZMA_H=1 -DHAVE_ZSTD_H=1 -DHAVE_LIBZSTD=1
 
 # FreeBSD SHLIB_MAJOR value is managed as part of the FreeBSD system.
 # It has no real relation to the libarchive version number.
@@ -15,6 +15,7 @@ SHLIB_MAJOR= 7
 
 CFLAGS+=	-DPLATFORM_CONFIG_H=\"${.CURDIR}/config_freebsd.h\"
 CFLAGS+=	-I${.OBJDIR}
+CFLAGS+=	-I${SRCTOP}/sys/contrib/zstd/lib
 
 .if ${MK_OPENSSL} != "no"
 CFLAGS+=	-DWITH_OPENSSL