Fixed several cases of unsafe use of get_all_args for optional args. Rev: src/builtin_functions.c:1.704 Rev: src/cpp.c:1.178 Rev: src/modules/Gettext/gettext.c:1.28 Rev: src/modules/Image/font.c:1.92 Rev: src/modules/_Roxen/roxen.c:1.56 Rev: src/modules/files/socket.c:1.112 Rev: src/modules/files/udp.c:1.84 Rev: src/post_modules/GTK2/source/gnomecanvas.pre:1.8 Rev: src/post_modules/GTK2/source/gtksourceiter.pre:1.7 Rev: src/post_modules/GTK2/source/gtktextiter.pre:1.14