dev-ruby/facter: sandbox tweak for /proc/self/oom_score_adj

dev-ruby/facter: sandbox tweak for /proc/self/oom_score_adj

Fix for sandbox bad opening:
[  3%] Generating /dev/shm/portage/dev-ruby/facter-3.12.3/work/facter-3.12.3/lib/src/java/com_puppetlabs_Facter.h
cd /dev/shm/portage/dev-ruby/facter-3.12.3/work/facter-3.12.3_build/lib && javah -classpath facter.jar -d /dev/shm/portage/dev-ruby/facter-3.12.3/work/facter-3.12.3/lib/src/java com.puppetlabs.Facter
* javah is not available for oracle-jre-bin-1.8 on x86_64
* IMPORTANT: some Java tools are not available on some VMs on some architectures
* javah is not available for oracle-jre-bin-1.8 on x86_64
* IMPORTANT: some Java tools are not available on some VMs on some architectures
 * ACCESS DENIED:  open_wr:      /proc/self/oom_score_adj
 * ACCESS DENIED:  open_wr:      /proc/self/oom_score_adj
make[2]: *** [lib/CMakeFiles/libfactersrc.dir/build.make:65: /dev/shm/portage/dev-ruby/facter-3.12.3/work/facter-3.12.3/lib/src/java/com_puppetlabs_Facter.h] Error 1
make[2]: Leaving directory '/dev/shm/portage/dev-ruby/facter-3.12.3/work/facter-3.12.3_build'

Package-Manager: Portage-2.3.56, Repoman-2.3.12
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>