patch: add longopts, --dry-run, add one more test

function                                             old     new   delta
patch_main                                          1110    1214    +104
static.patch_longopts                                  -      47     +47
packed_usage                                       26738   26761     +23
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(add/remove: 1/0 grow/shrink: 2/0 up/down: 174/0)             Total: 174 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
3 files changed