.gitignore: add *.od and /misc/omfdump
.gitignore: add *.od and /misc/omfdump

A few generated files missing from .gitignore.

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@linux.intel.com>

techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm