[packages/apache-mod_pagespeed] (15 commits) ...Merge branch 'dev-1.8': up to 1.8.31.6

[glen]

Summary of changes:

  ffebf8b... up to 1.8.31.5 (*)
  71e04b2... use default checkout url for stable releases (*)
  af12821... build with system openssl (*)
  99c7dfc... build with system icu (*)
  5eafce7... use system yasm (*)
  a438a3d... skip src/build/internal (*)
  c7d0bb1... cosmetics (*)
  81c4dc2... move clean source to separate script (*)
  d1259ec... cleanup more unneeded files for build (*)
  a673cf5... add comments about third party dirs (*)
  a16986b... patch apache config to be apache 2.4 compatible (*)
  8ff01c2... exclude 1.9 betas (*)
  21b9e54... up to 1.8.31.6-stable (*)
  59d9f80... disable strip examples (*)
  1c2e9c0... Merge branch 'dev-1.8': up to 1.8.31.6

(*) This commit already existed in another branch; no separate mail sent