Merge branch 'mk/diff-delta-uint-may-be-shorter-than-ulong'

The machinery to create xdelta used in pack files received the sizes of the data in size_t, but lost the higher bits of them by storing them in "unsigned int" during the computation, which is fixed. * mk/diff-delta-uint-may-be-shorter-than-ulong: diff-delta: fix encoding size that would not fit in "unsigned int"