Add support for DS1621+ and DS1821+

Taking info from several sources, it seems like the AMD Ryzen V1500B is a X86_64 processor.

- SynoCommunity/spksrc#4170
- eizedev/AirConnect-Synology@80f7c87

Author: leipert

build-in-docker.sh

@@ -20,7 +20,7 @@ for d in /toolkit/build_env/* ; do
 done
 
 export OVERRIDE_PKGARCH_armv7="alpine alpine4k armadaxp armada375 armada38x monaco"
-export OVERRIDE_PKGARCH_x86_64="x86 bromolow cedarview avoton braswell broadwell dockerx64 kvmx64 grantley denverton apollolake broadwellnk geminilake"
+export OVERRIDE_PKGARCH_x86_64="x86 bromolow cedarview avoton braswell broadwell dockerx64 kvmx64 grantley denverton apollolake broadwellnk geminilake v1000"
 
 pushd /toolkit >/dev/null
 ./pkgscripts-ng/PkgCreate.py -c syncthing