mkproto.awk, and structs that don't exist.

[Luke Kenneth Casson Leighton]

can mkproto.awk be made to use the #ifdefs from autoconf?  so, if
HAVE_ACL doesn't exist, the c compiler won't generate the code.
_however_, mkproto will still generate a function prototype in proto.h,
therefore you get a compilation error (e.g aclent_t undefined) or a
warning error in every single compile (e.g struct stat64 defined in the
prototype which is probably not what you want).

luke