Bug#363922: x11 libraries don't call ldconfig

[Justin Pryzby <justinpryzby@users.sourceforge.net>]

Package: libfontenc,libxfont,libxrender,xcursor,xft,xorg-x11,xserver-xorg-video-i810,xserver-xorg-video-via
Severity: serious
Justification: 8.1.1: Any package installing shared libraries in one
 of the default library directories of the dynamic linker (which are
 currently `/usr/lib' and `/lib') or a directory that is listed in
 `/etc/ld.so.conf'[1] must use `ldconfig' to update the shared library
 system.

The lack of a newline means that they have no postinstall script at
all:

Setting up libx11-dev (1.0.0-6) ...
Setting up libxfixes3 (3.0.1.2-2+b1) ...
Setting up libxfixes-dev (3.0.1.2-2+b1) ...
Setting up libxrender1 (0.9.0.2-3) ...
Setting up libxrender-dev (0.9.0.2-3) ...
Setting up libxcursor1 (1.1.5.2-3) ...
Setting up libxcursor-dev (1.1.5.2-3) ...
Setting up xbase-clients (7.0.0-4) ...