Add umockdev to the book

[Douglas R. Reno]

As discussed in ​http://lists.linuxfromscratch.org/pipermail/blfs-dev/2020-April/037328.html, umockdev is required for the tests in gnome-settings-daemon. After doing a search, it can also be used for:

general/genlib/libgudev.xml:      <ulink url="https://github.com/martinpitt/umockdev">umockdev</ulink>
general/genlib/libgudev.xml:<screen><userinput>./configure --prefix=/usr --disable-umockdev &amp;&amp;
general/sysutils/upower.xml:      <ulink url="https://github.com/martinpitt/umockdev">umockdev</ulink>
gnome/platform/gnome-settings-daemon.xml:      <ulink url="https://github.com/martinpitt/umockdev">umockdev</ulink>

Note that we'll have to remove "--disable-umockdev" from libgudev. As always with package additions, I'll test umockdev with the above packages to make sure that it functions properly and does not cause any problems.

umockdev allows a test suite to create mock hardware devices to test functionality with. It seems to be CMMI.

This package will be placed in "General Libraries"

[Douglas R. Reno]

Fixed at r22934

[Bruce Dubbs]

Milestone renamed

[Bruce Dubbs]

Milestone renamed