[PATCH 1/2] Add buf_eq() function to check buffers for equality

[Stefan Tomanek]

Dies schrieb Stefan Tomanek (stefan.tomanek at wertarbyte.de):

> A common task is to compare two buffers of variable size; this change adds a
> common function to achieve this goal.

(the second patch of this set is currently stuck in moderation because of its
size)