virtiofsd: Allow to build it without the tools

This changed the Meson build script to allow virtiofsd be built even
though the tools build is disabled, thus honoring the --enable-virtiofsd
option.

Fixes: cece116 (configure: add option for virtiofsd)
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20210201211456.1133364-2-wainersm@redhat.com>
Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

tools/meson.build

@@ -10,8 +10,11 @@ if get_option('virtiofsd').enabled()
       error('virtiofsd requires Linux')
     elif not seccomp.found() or not libcap_ng.found()
       error('virtiofsd requires libcap-ng-devel and seccomp-devel')
-    elif not have_tools or 'CONFIG_VHOST_USER' not in config_host
-      error('virtiofsd needs tools and vhost-user support')
+    elif 'CONFIG_VHOST_USER' not in config_host
+      error('virtiofsd needs vhost-user support')
+    else
+      # Disabled all the tools but virtiofsd.
+      have_virtiofsd = true
     endif
   endif
 elif get_option('virtiofsd').disabled() or not have_system