infrastructure updates from TL

git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4778 0b2b3880-5936-4365-a048-eb17d2e5a6bf
merge r4754-4756,4759-4762,4765-4771,4774-4777 from trunk

git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4779 0b2b3880-5936-4365-a048-eb17d2e5a6bf
revert the build_cpu change (PEB says I was wrong), and previous commit missed r4777


git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4780 0b2b3880-5936-4365-a048-eb17d2e5a6bf
new experimental repo

git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4784 0b2b3880-5936-4365-a048-eb17d2e5a6bf
added -g3 switch for debugging; -j 4 -l 5.0 for parallel

git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4785 0b2b3880-5936-4365-a048-eb17d2e5a6bf
sync with trunk

git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4787 0b2b3880-5936-4365-a048-eb17d2e5a6bf
fixed wrong upvalues in luajit

git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4788 0b2b3880-5936-4365-a048-eb17d2e5a6bf
patch for  wrong upvalues in luajit

git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4789 0b2b3880-5936-4365-a048-eb17d2e5a6bf
fixed missing spaces in patch-01-LuaJITTeX 

git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4791 0b2b3880-5936-4365-a048-eb17d2e5a6bf
sync with luatex

git-svn-id: https://foundry.supelec.fr/svn/luatex/branches/experimental@4794 0b2b3880-5936-4365-a048-eb17d2e5a6bf