allow freeing glue_specs

git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@4754 0b2b3880-5936-4365-a048-eb17d2e5a6bf
new versions supporting jit

git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@4755 0b2b3880-5936-4365-a048-eb17d2e5a6bf
new version of mtxrun_exe.c . The exe are valid only for Windows 32bit

git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@4756 0b2b3880-5936-4365-a048-eb17d2e5a6bf
added amalgamation of lpeg0.12, for a future upgrade of lpeg

git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@4759 0b2b3880-5936-4365-a048-eb17d2e5a6bf
fix remove fo the case head==current

git-svn-id: https://foundry.supelec.fr/svn/luatex/trunk@4760 0b2b3880-5936-4365-a048-eb17d2e5a6bf