Simplify and speed up the kyua build

Instead of having multiple kyua libraries, just include the files as part
of usr.bin/kyua. Previously, we would build each kyua source up to four
times: once as a .o file and once as a .pieo. Additionally, the kyua
libraries might be built again for compat32. As all the kyua libraries
amount to 102 C++ sources the build time is significant (especially when
using an assertions enabled compiler). This change ensures that we build
306 fewer .cpp source files as part of buildworld.

Reviewed By: brooks
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D30967

Remove lib/kyua from the build

I forgot to include this line in 2eb9ad427475190e87d026de4ca7fc296947f2a0.

Reported by: Jenkins CI
MFC after: 1 week
Fixes: 2eb9ad427475190ei ("Simplify and speed up the kyua build")

Revert "Remove lib/kyua from the build"

Accidentally removed it from the wrong file...

This reverts commit 8ec4ba8a76aaf256942ac5996d45cc29022641ae.

Remove lib/kyua from the build

I forgot to include this line in 2eb9ad427475190e87d026de4ca7fc296947f2a0.

Reported by: Jenkins CI
MFC after: 1 week
Fixes: 2eb9ad427475190ei ("Simplify and speed up the kyua build")

(cherry picked from commit 2eb9ad427475190e87d026de4ca7fc296947f2a0)
(cherry picked from commit 8ec4ba8a76aaf256942ac5996d45cc29022641ae)
(cherry picked from commit 89da04fcaa33f100a60d06770f7424e5b7f1312f)
(cherry picked from commit c951566915886330612bee880d6ece0d65bf9f5d)