sync code with last improvements from OpenBSD

lib/libxtrans/README.md

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+xtrans - X Network Transport layer shared code
+----------------------------------------------
+
+xtrans is a library of code that is shared among various X packages to
+handle network protocol transport in a modular fashion, allowing a
+single place to add new transport types.  It is used by the X server,
+libX11, libICE, the X font server, and related components.
+
+It is however, *NOT* a shared library, but code which each consumer
+includes and builds it's own copy of with various #ifdef flags to make
+each copy slightly different.  To support this in the modular build
+system, this package simply installs the C source files into
+$(prefix)/include/X11/Xtrans and installs a pkg-config file and an
+autoconf m4 macro file with the flags needed to use it.
+
+Documentation of the xtrans API can be found in the included xtrans.xml
+file in DocBook XML format. If 'xmlto' is installed, you can generate text,
+html, postscript or pdf versions of the documentation by configuring
+the build with --enable-docs, which is the default.
+
+ --------------------------------------------------------------------------
+
+All questions regarding this software should be directed at the
+Xorg mailing list:
+
+  https://lists.x.org/mailman/listinfo/xorg
+
+The primary development code repository can be found at:
+
+  https://gitlab.freedesktop.org/xorg/lib/libxtrans
+
+Please submit bug reports and requests to merge patches there.
+
+For patch submission instructions, see:
+
+  https://www.x.org/wiki/Development/Documentation/SubmittingPatches