[bootlin/training-materials] 3a1289: labs/sysdev: Fix buildroot directory name

[Gregory Clement]

  Branch: refs/heads/master
  Home:   https://github.com/bootlin/training-materials
  Commit: 3a128908b43f81db738710d0a43cff62a69ac3ae
      https://github.com/bootlin/training-materials/commit/3a128908b43f81db738710d0a43cff62a69ac3ae
  Author: Gregory CLEMENT <gregory.clement at bootlin.com>
  Date:   2022-09-29 (Thu, 29 Sep 2022)

  Changed paths:
    M labs/sysdev-application-development-and-debugging/sysdev-application-development-and-debugging.tex
    M labs/sysdev-buildroot/sysdev-buildroot.tex

  Log Message:
  -----------
  labs/sysdev: Fix buildroot directory name

As now we get buildroot from git, then the directory is simply named
buildroot without any suffix for the version.

Signed-off-by: Gregory CLEMENT <gregory.clement at bootlin.com>