[illumos-Developer] webrev #687: rpcgen should not generate absolute #includes

[Stepan Zastupov]

This patch introduce option -p to prevent rpcgen from generating
includes with absolute paths.
A few notes:
1) I use basename(3) function, which conforms to POSIX.1-2001. Is it fine?
2) I haven't documented the option since I'm not sure is '-p' a good name.

http://cr.illumos.org/view/mchniy2i/illumos-687-webrev/

--
BR, Stepan.