merge xorg-serer 21.1.3.

merge xorg-server 1.20.3.

first merge of netbsd changes. not tested yet.

merge xorg-server 1.9.2.

various build fixes for modern xextproto/libXext and friends. some of
this came from pkgsrc, and some of it i had to figure out myself.

initial import of xorg-server-1.4.2