kexec-tools: work around broken release tarball

There are hard links from files to themselves in the tarball and
bsdtar fails to extract them. Skip extraction and use GNU tar instead.

srcpkgs/kexec-tools/template

@@ -2,7 +2,9 @@
 pkgname=kexec-tools
 version=2.0.20
 revision=1
+create_wrksrc=yes
 build_style=gnu-configure
+hostmakedepends="tar xz"
 makedepends="zlib-devel liblzma-devel"
 short_desc="Tools to support fast kexec reboots"
 maintainer="Orphaned <orphan@voidlinux.org>"
@@ -10,6 +12,7 @@ license="GPL-2.0-only"
 homepage="http://kernel.org/pub/linux/utils/kernel/kexec/"
 distfiles="${KERNEL_SITE}/utils/kernel/kexec/${pkgname}-${version}.tar.xz"
 checksum=dad8077f0315445d1f6335579fc4ade222facf82a67124974c7be5303ba4f8c8
+skip_extraction="${pkgname}-${version}.tar.xz"
 
 case "$XBPS_TARGET_MACHINE" in
 	i686*) broken="https://build.voidlinux.org/builders/i686_builder/builds/19200/steps/shell_3/logs/stdio" ;;
@@ -19,6 +22,14 @@ case "$XBPS_TARGET_MACHINE" in
 	ppc-musl) nopie=yes;; # textrels not supported
 esac
 
+do_extract() {
+	# bsdtar fails to extract version 2.0.20 tarball which
+	# contains (buggy) hard links from files to themselves.
+	tar --strip-components 1 --no-same-owner --extract --file \
+		${XBPS_SRCDISTDIR}/${pkgname}-${version}/${pkgname}-${version}.tar.xz \
+		--directory ${wrksrc}
+}
+
 pre_build() {
 	rm ${XBPS_WRAPPERDIR}/strip
 	case "$XBPS_TARGET_MACHINE" in