Patch for static holidays with year

Attached is a rudimentary patch to lib/holidays.h and lib/holidays.c
which allows you to optionally specify a year on static holiday entries.
(Anything not in the current year is simply ignored.)

 
We needed this type of functionality for organization-chosen floating
holidays. For example we get two days for Christmas, but which days
vary. (This year 12/25, 12/26...next year 12/24, 12/25...then 12/23,
12/24...12/23, 12/26, etc.)

 
I'm certainly open to better solutions, but this appears to work-sample
holidays for this year show up on info screens...samples for other years
are ignored.

 
Cheers.

Darin Dugan

user-b33a1547d27a@xymon.invalid