generic: disable openvswitch

openvswitch fails to build with groff v1.23 on the build system.

This hasn't reached a Debian Release yet but is already present
on rolling release distros and causes the gluon build to fail.

Since we don't need openvswitch the best temporary fix seems to
disable building it by default until this get's resolved upstream.

targets/generic

@@ -53,6 +53,18 @@ try_config('PACKAGE_dnsmasq_full_noid', false)
 try_config('PACKAGE_dnsmasq_full_broken_rtc', false)
 try_config('PACKAGE_dnsmasq_full_rtc', false)
 
+try_config('PACKAGE_openvswitch', false) -- fails to build
+try_config('PACKAGE_kmod-openvswitch', false) -- fails to build
+try_config('PACKAGE_kmod-openvswitch-geneve', false) -- fails to build
+try_config('PACKAGE_kmod-openvswitch-geneve-intree', false) -- fails to build
+try_config('PACKAGE_kmod-openvswitch-gre', false) -- fails to build
+try_config('PACKAGE_kmod-openvswitch-gre-intree', false) -- fails to build
+try_config('PACKAGE_kmod-openvswitch-intree', false) -- fails to build
+try_config('PACKAGE_kmod-openvswitch-lisp-intree', false) -- fails to build
+try_config('PACKAGE_kmod-openvswitch-stt-intree', false) -- fails to build
+try_config('PACKAGE_kmod-openvswitch-vxlan', false) -- fails to build
+try_config('PACKAGE_kmod-openvswitch-vxlan-intree', false) -- fails to build
+
 try_config('TARGET_SQUASHFS_BLOCK_SIZE', 256)
 
 config('KERNEL_PROC_STRIPPED', true)