sys-apps/portage: version bump to 2.3.25

sys-apps/portage: version bump to 2.3.25

  #582140 - Portage does not reduce values of USE_EXPAND variables
      to IUSE_EFFECTIVE in some cases
  #608564 - add emerge --ignore-world option to disregard @world
      when solving dependencies
  #622462 - emerge --autounmask tries to wrongly unmask a hardmasked
      package instead of telling user to change USE conflicting flags
  #631358 - add emerge --changed-slot option
  #647654 - filter-bash-environment.py input is not buffered, it reads
      1 byte at a time
  #647940 - "emerge --search" fails to find a package when provided
      with an exact match, $CAT/$PKG
  #648062 - portageq repositories_configuration <eroot> does not
      override PORTAGE_CONFIGROOT
  #648432 - File merging is ultra-slow on FreeBSD
  #648790 - add parallel aux_get method for things like repoman to use
  #649418 - security.capability extended attribute not preserved
      between different filesystems
  #649464 - dev-util/gtk-update-icon-cache-3.22.19 - QA Notice: new
      icons were found installed but GTK+ icon cache has not been updated
  #649524 - prepstrip: Preservation of extended attributes using
      getfattr+setfattr does not preserve extended attributes outside of
      user namespace
  #649528 - prepstrip: Preservation of extended attributes using
      xattr-helper.py broken
  #650754 - emerge --info is broken without git installed if PORTDIR
      is a git checkout and sync-type = git
  #651214 - {PKG_,}INSTALL_MASK support for exclusions

Package-Manager: Portage-2.3.24, Repoman-2.3.6