'==' not portable WAS include/X11/Xos_r.h and NetBSD

[Donnie Berkholz]

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Jeremy C. Reed wrote:
| I found an error in libX11/configure.ac:
|
| The test expression for xthreads uses two equals. This is not portable.
| if test x$xthreads == xyes ; then
|
| And NetBSD complains:
|
| test: ==: unexpected operator
|
| I fixed that on my system to use one =.

There were numerous instances of this, all in either
lib/X11/configure.ac or xserver/xorg/configure.ac. I just fixed all of them.

Thanks for the report.

Donnie
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