More warning fixes. This completes the work in luatexdir/tex

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

source/texk/web2c/luatexdir/font/mapfile.h

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

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

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

source/texk/web2c/luatexdir/ptexlib.h

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

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

source/texk/web2c/luatexdir/tex/arithmetic.h

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

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

source/texk/web2c/luatexdir/tex/directions.h

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

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

source/texk/web2c/luatexdir/tex/equivalents.h

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

source/texk/web2c/luatexdir/tex/errors.h

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

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

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