linux4.9: update to 4.9.217.

Do not build on archs that we don't have a -dotconfig file.
That means it won't be built on armv7 anymore unless someone
makes a proper -dotconfig file.

srcpkgs/linux4.9/template

@@ -1,6 +1,6 @@
 # Template file for 'linux4.9'
 pkgname=linux4.9
-version=4.9.215
+version=4.9.217
 revision=1
 patch_args="-Np1"
 wrksrc="linux-${version}"
@@ -9,7 +9,7 @@ homepage="https://www.kernel.org"
 license="GPL-2.0-only"
 short_desc="Linux kernel and modules (${version%.*} series)"
 distfiles="https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-${version}.tar.xz"
-checksum=236f2f47853700f22b9925cb17917d97ff7120fcc8110ec827c5a030a8129f48
+checksum=6fb2a54602ebf750a39ba9750dc8d3bc34308518647f5bd2f562dee4d2566819
 
 nodebug=yes  # -dbg package is generated below manually
 nostrip=yes
@@ -17,7 +17,7 @@ noverifyrdeps=yes
 noshlibprovides=yes
 preserve=yes
 
-archs="i686* x86_64* armv7l* aarch64* ppc*"
+archs="i686* x86_64* aarch64* ppc*"
 hostmakedepends="bc perl kmod uboot-mkimage libressl-devel"
 
 case "$XBPS_TARGET_MACHINE" in