[PATCH] Add grub_dcprintf for continuations without file/line

[Josh Triplett]

The attached patch adds a new variant of grub_dprintf, grub_dcprintf,
which avoids printing the __FILE__:__LINE__: prefix.  This allows
printing a single line with multiple print statements; for instance:

grub_dprintf("some_module", "Thingy: ");
print_complicated_thingy(thingy);
grub_dcprintf("some_module", ", more details here\n");

Without the dcprintf variant, this line will contain three different
file/line prefixes.

I also added support for a "no-file-line" token in the debug environment
variable, which turns off the file/line prefixes entirely.

- Josh Triplett

grub-dprintf-no-file-line.patch
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