multiprocessing.eclass: make loadavg regex work for float values

Bug: https://bugs.gentoo.org/630626

eclass/multiprocessing.eclass

@@ -120,7 +120,7 @@ makeopts_loadavg() {
  # This assumes the first .* will be more greedy than the second .*
  # since POSIX doesn't specify a non-greedy match (i.e. ".*?").
  local lavg=$(echo " $* " | sed -r -n \
- -e 's:.*[[:space:]](-[a-z]*l|--(load-average|max-load)[=[:space:]])[[:space:]]*([0-9]+|[0-9]+\.[0-9]+).*:\3:p' \
+ -e 's:.*[[:space:]](-[a-z]*l|--(load-average|max-load)[=[:space:]])[[:space:]]*([0-9]+(\.[0-9]+)?)[[:space:]].*:\3:p' \
  -e "s:.*[[:space:]](-[a-z]*l|--(load-average|max-load))[[:space:]].*:${2:-999}:p")
  # Default to ${inf} since the default is to not use a load limit.
  echo ${lavg:-${2:-999}}