more const

source/texk/web2c/luatexdir/dvi/dvigen.c

source/texk/web2c/luatexdir/font/dofont.c

source/texk/web2c/luatexdir/lang/texlang.c

source/texk/web2c/luatexdir/lua/lnodelib.c

source/texk/web2c/luatexdir/lua/ltexlib.c

source/texk/web2c/luatexdir/lua/luatoken.c

source/texk/web2c/luatexdir/ocp/ocp.c

source/texk/web2c/luatexdir/ocp/ocplist.c

source/texk/web2c/luatexdir/ocp/readocp.c

source/texk/web2c/luatexdir/pdf/pdfgen.c

source/texk/web2c/luatexdir/pdf/pdflistout.c

source/texk/web2c/luatexdir/pdf/pdfshipout.c

source/texk/web2c/luatexdir/tex/align.c

source/texk/web2c/luatexdir/tex/linebreak.c