removed the compiler warnings for luatexdir/font/writeXXX.c

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

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

source/texk/web2c/luatexdir/font/subfont.txt

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

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

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

source/texk/web2c/luatexdir/font/writet1.c

source/texk/web2c/luatexdir/font/writet3.c

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

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

source/texk/web2c/luatexdir/font/writetype0.c

source/texk/web2c/luatexdir/font/writetype2.c

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

source/texk/web2c/luatexdir/ptexlib.h