sync code with last improvements from OpenBSD

lib/libXfont2/README.md

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+libXfont - X font handling library for server & utilities
+---------------------------------------------------------
+
+libXfont provides the core of the legacy X11 font system, handling the index
+files (fonts.dir, fonts.alias, fonts.scale), the various font file formats,
+and rasterizing them.  It is used by the X display servers (Xorg, Xvfb, etc.)
+and the X Font Server (xfs), but should not be used by normal X11 clients.  X11
+clients access fonts via either the new APIs in libXft, or the legacy APIs in
+libX11.
+
+libXfont supports a number of compression and font formats, and the
+configure script takes various options to enable or disable them:
+
+- Compression types:
+
+  * gzip - always enabled, no option to disable, requires libz
+
+  * bzip2 - disabled by default, enable via --with-bzip2, requires libbz2
+
+- Font formats:
+
+  * builtins - copies of the "fixed" & "cursor" fonts required by the
+    X protocol are built into the library so the X server always
+    has the fonts it requires to start up.   Accessed via the
+    special 'built-ins' entry in the X server font path.  
+    Enabled by default, disable via --disable-builtins.
+
+  * freetype - handles scalable font formats including OpenType, FreeType,
+    and PostScript formats.  Requires FreeType2 library.
+    Can also be used to handle bdf & bitmap pcf font formats.  
+    Enabled by default, disable via --disable-freetype.
+
+  * bdf bitmap fonts - text file format for distributing fonts, described
+    in https://www.x.org/docs/BDF/bdf.pdf specification.  Normally
+    not used by the X server at runtime, as the fonts distributed
+    by X.Org in bdf format are compiled with bdftopcf when
+    installing/packaging them.  
+    Enabled by default, disable via --disable-bdfformat.
+
+  * pcf bitmap fonts - standard bitmap font format since X11R5 in 1991,
+    used for all bitmap fonts installed from X.Org packages.
+    Compiled format is architecture independent.
+    As noted above, usually produced by bdftopcf.  
+    Enabled by default, disable via --disable-pcfformat.
+
+  * snf bitmap fonts - standard bitmap font format prior to X11R5 in 1991,
+    remains only for backwards compatibility.  Unlike pcf, snf files
+    are architecture specific, and contain less font information
+    than pcf files.  snf fonts are deprecated and support for them
+    may be removed in future libXfont releases.  
+    Disabled by default, enable via --disable-snfformat.
+
+- Font services:
+
+  * xfs font servers - allows retrieving fonts as a client of an xfs server.
+    Enabled by default, disable via --disable-fc (font client).
+
+    If enabled, you can also use the standard libxtrans flags to
+    configure which transports can be used to connect to xfs:
+    
+        --enable-unix-transport  Enable UNIX domain socket transport
+        --enable-tcp-transport   Enable TCP socket transport (IPv4)
+        --enable-ipv6            Enable IPv6 support for tcp-transport
+        --enable-local-transport Enable os-specific local transport
+
+    (Change --enable to --disable to force disabling support.)  
+    The default setting is to enable all of the transports the
+    configure script can find OS support for.
+
+--------------------------------------------------------------------------
+
+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/libXfont
+
+Please submit bug reports and requests to merge patches there.
+
+For patch submission instructions, see:
+
+  https://www.x.org/wiki/Development/Documentation/SubmittingPatches