Modify coverage.sh to run kcov as non-root user.

Author: HackingM

.gentoo/coverage.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 
-kcov --bash-dont-parse-binary-dir \
+useradd -m -G users -s /bin/bash testrunner
+
+su - testrunner -c "kcov --bash-dont-parse-binary-dir \
      --include-path=. \
      /var/tmp/coverage \
-     bats -t tests
+     bats -t tests"