add libpthread-stubs.
merge libxcb 1.10 and libpthread-stubs build.
update the libxcb generated files.
various updates for libdrm 2.4.52.
updates for libdrm 2.4.52.
regenerate for xkeyboard-config 2.11.
update for mkfontscale 1.1.1.
updates for makedepend 1.0.5.
avoid const problems for now.
updates for xauth 1.0.8 and xconsole 1.0.6.
Add fstrans_startnowait()/fstrans_done() to vrele_thread().
Change sysctl_kern_vnode() to use vfs_vnode_iterator.
Change snapshot_expunge() to use vfs_vnode_iterator.
Change ffs_sync() to use vfs_vnode_iterator.
Change ext2fs_sync() to use vfs_vnode_iterator.
Change quota1_handle_cmd_quotaon() and q1sync() to use vfs_vnode_iterator.
Change vismarker() to VI_MARKER for lfs_writevnodes().
This operation has to be changed to vfs_vnode_iterator.
Change lfsquota1_handle_cmd_quotaon() and lfs_q1sync()
to use vfs_vnode_iterator.
Change nfs_sync() to use vfs_vnode_iterator.
Change nfs_clearcommit() to use vfs_vnode_iterator.
Change msdosfs_sync() to use vfs_vnode_iterator.