rm #define internalfontnumber, it's now internal_font_number throughout

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

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

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

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

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

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

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

source/texk/web2c/luatexdir/image/pdftoepdf.cc

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

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