scsi: Ignore executable for in-tree builds

The new qemu-pr-helper (commit b855f8d1) should not be checked in,
even when doing in-tree builds.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20170926151421.14557-1-eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

.gitignore

@@ -49,6 +49,7 @@
 /qemu-version.h
 /qemu-version.h.tmp
 /module_block.h
+/scsi/qemu-pr-helper
 /vscclient
 /vhost-user-scsi
 /fsdev/virtfs-proxy-helper