This makes it so that slave=1 works again as it should.

The changes introduced earlier resulted in the unintentional requirement
to specify the actual port number, breaking backwards compatibility.

Fixes: ArcticaProject/nx-libs#518

Attributes GH PR #513: https://github.com/ArcticaProject/nx-libs/pull/513

nx-X11/programs/Xserver/hw/nxagent/Render.c: use macros obtaining values from _XPrivDisplay instead of the other Display structure directly.

Fixes: ArcticaProject/nx-libs#512

It's unclear to me why (Display*)(dpy)->bitmap_pad and
(_XPrivDisplay)(dpy)->bitmap_pad produce different results.

Technically, Display is referencing the _XDisplay/Display structure
defined in Xlibint.h, while _XPrivDisplay is a typedef'd pointer to the
(anonymous) structure defined in Xlib.h, since we're not defining the
XLIB_ILLEGAL_ACCESS macro. The weird part is that both should be equal
when it comes to its bitmap_pad, byte_order and bitmap_bit_order
members.

Attributes GH PR #508: https://github.com/ArcticaProject/nx-libs/pull/508

Fixes: ArcticaProject/nx-libs#507

nxcomp/src/{Loop,Proxy}.cpp: On Debian/kFreeBSD (and other *BSD variants) the sockaddr_un.sun_path property is 104 chars long, not 108. Hard-coding Unix domain sockets in nxcomp the string length 104.

 Fixes ArcticaProject/nx-libs#507.

Mesa.patches: Add 5001_nasty-typo-fixes.patch. Fix some nasty typos in Mesa's code ending up in the nxagent binary.

Attributes GH PR #489: https://github.com/ArcticaProject/nx-libs/pull/489

 This code can be reactivated any time in the future once
 some potential maintainer turns up and makes this work
 on the MS Windows / Cygwin platform.

Attributes GH PR #488: https://github.com/ArcticaProject/nx-libs/pull/488

nx-X11/programs/Xserver/Render.c: Re-introduce nxagentGlyphsCleanup() from libNX_Xrender's formerly removed XRenderGlyphsCleanup().

Attributes GH PR #498: https://github.com/ArcticaProject/nx-libs/pull/498

m4/nx-macros.m4: Add NX_STRICT_OPTION and NX_DEFAULT_OPTIONS macros (borrowed from X.org's xorg-macros.m4).

Attributes GH PR #501: https://github.com/ArcticaProject/nx-libs/pull/501

Fixes ArcticaProject/nx-libs#500