Add lief, Library to Instrument Executable Formats.

It built (at least on macOS) with all the vendored libraries, but we
generally want to link with pkgsrc-installed libraries when possible.
Seems like that's going to take more work.

Motivation: https://github.com/fzakaria/sqlelf needs the Python bindings
from this library.

lief/DESCR

@@ -0,0 +1,11 @@
+The purpose of this project is to provide a cross platform library which
+can parse, modify and abstract ELF, PE and MachO formats.
+
+Main features:
+
+- Parsing: LIEF can parse ELF, PE, MachO, OAT, DEX, VDEX, ART and
+  provides an user-friendly API to access to format internals.
+- Modify: LIEF enables to modify some parts of these formats
+- Abstract: Three formats have common features like sections, symbols,
+  entry point... LIEF factors them. API: LIEF can be used in C, C++
+  and Python

lief/Makefile

@@ -0,0 +1,49 @@
+# $NetBSD$
+
+DISTNAME=		LIEF-0.14.1
+PKGNAME=		${DISTNAME:tl}
+CATEGORIES=		devel
+MASTER_SITES=		${MASTER_SITE_GITHUB:=lief-project/}
+GITHUB_TAG=		${PKGVERSION_NOREV}
+
+MAINTAINER=		pkgsrc-users@NetBSD.org
+HOMEPAGE=		https://lief-project.github.io/
+COMMENT=		Library to Instrument Executable Formats
+LICENSE=		apache-2.0
+
+USE_TOOLS+=		pkg-config
+USE_LANGUAGES=		c c++
+USE_CXX_FEATURES=	c++17
+FORCE_CXX_STD=		c++17
+
+CMAKE_CONFIGURE_ARGS+=	-DLIEF_OPT_MBEDTLS_EXTERNAL=1
+CMAKE_CONFIGURE_ARGS+=	-DLIEF_ENABLE_JSON=1 \
+			-DLIEF_OPT_NLOHMANN_JSON_EXTERNAL=1
+CMAKE_CONFIGURE_ARGS+=	-DLIEF_FROZEN_ENABLED=1 \
+			-DLIEF_OPT_FROZEN_EXTERNAL=1
+CMAKE_CONFIGURE_ARGS+=	-DLIEF_EXTERNAL_EXPECTED=1
+CMAKE_CONFIGURE_ARGS+=	-DLIEF_OPT_UTFCPP_EXTERNAL=1
+
+PKGCONFIG_OVERRIDE+=	cmake/LIEF.pc.in
+
+# make sure the vendored versions don't get found
+post-extract:
+	rm ${WRKSRC}/third-party/mbedtls*.zip
+	rm ${WRKSRC}/third-party/json*.zip
+	rm ${WRKSRC}/third-party/expected*.zip
+	rm ${WRKSRC}/third-party/frozen*.zip
+	rm ${WRKSRC}/third-party/utfcpp*.zip
+	rm ${WRKSRC}/third-party/spdlog*.zip
+
+# needs Git at build time???
+# "tcb-span"? LIEF_EXTERNAL_SPAN, LIEF_EXTERNAL_SPAN_DIR
+# py-sqlelf will want the python bindings installed (BUILD_DIRS+=api/python)
+
+.include "../../devel/cmake/build.mk"
+.include "../../devel/frozen/buildlink3.mk"
+.include "../../devel/spdlog/buildlink3.mk"
+.include "../../devel/tl-expected/buildlink3.mk"
+.include "../../security/mbedtls3/buildlink3.mk"
+.include "../../textproc/nlohmann-json/buildlink3.mk"
+.include "../../textproc/utf8-cpp/buildlink3.mk"
+.include "../../mk/bsd.pkg.mk"