Ignore generated programs from the top-level .gitignore.

Prefix other entries with '/' to make them non-recursive.

working directories for install functions.

oleaut32: Make ctl2_hash_guid match the same function in widl, which has likely had much wider testing.

in a 16 bit int and not in a 8 bit int as previously supposed, using a 0x1ff
mask. Upper 16 bits contains the ordinal number of the function. 
Allocation of the "recbuf" must be modified, to support larger data
(based on a patch by White Snake <whitesnake78@mail.com>).