.gitignore: remove vscclient

It was removed with libcacard, since:

commit 7b02f544
Author: Marc-André Lureau <marcandre.lureau@redhat.com>
Date:   Sun Aug 30 11:48:40 2015 +0200

    libcacard: use the standalone project
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

.gitignore

@@ -53,7 +53,6 @@
 /qemu-version.h.tmp
 /module_block.h
 /scsi/qemu-pr-helper
-/vscclient
 /vhost-user-scsi
 /fsdev/virtfs-proxy-helper
 *.tmp