linux4.9: update to 4.9.258

Convert template to base tarball + patch scheme.

srcpkgs/linux4.9/template

@@ -1,15 +1,18 @@
 # Template file for 'linux4.9'
 pkgname=linux4.9
-version=4.9.257
+version=4.9.258
 revision=1
-wrksrc="linux-${version}"
+wrksrc="linux-${version%.*}"
 short_desc="Linux kernel and modules (${version%.*} series)"
 maintainer="Orphaned <orphan@voidlinux.org>"
 license="GPL-2.0-only"
 homepage="https://www.kernel.org"
-distfiles="https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-${version}.tar.xz"
-checksum=95e780fffc81de8217a31a3e6e212b69643f5344e9ba0dabaa6e426126f6d64f
+distfiles="https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-${version%.*}.tar.xz
+ https://cdn.kernel.org/pub/linux/kernel/v4.x/patch-${version}.xz"
+checksum="029098dcffab74875e086ae970e3828456838da6e0ba22ce3f64ef764f3d7f1a
+ 5a35fc05ba60b80588592cade43ddea4bdef0933882767bf8ad7e2a6f4ff2a4a"
 python_version=2 #unverified
+skip_extraction="patch-${version}.xz"
 patch_args="-Np1"
 
 nodebug=yes  # -dbg package is generated below manually
@@ -19,7 +22,7 @@ noshlibprovides=yes
 preserve=yes
 
 archs="i686* x86_64* aarch64* ppc*"
-hostmakedepends="bc perl kmod uboot-mkimage libressl-devel"
+hostmakedepends="bc perl kmod uboot-mkimage libressl-devel xz"
 
 case "$XBPS_TARGET_MACHINE" in
 	ppc64le*) broken="No ppc64le support";;
@@ -46,6 +49,10 @@ export KBUILD_BUILD_TIMESTAMP=${SOURCE_DATE_EPOCH:-0}
 export KBUILD_BUILD_USER=voidlinux
 export KBUILD_BUILD_HOST=voidlinux
 
+pre_patch() {
+	xzcat $XBPS_SRCDISTDIR/$pkgname-$version/patch-${version}.xz | patch -Np1
+}
+
 do_configure() {
 	# If there's a file called <arch>-dotconfig, use it to
 	# configure the kernel; otherwise use arch defaults and all stuff