Change approach for getaddrinfo support. Now, only fake-addrinfo.h is

Change approach for getaddrinfo support.  Now, only fake-addrinfo.h is
included, no magic macros need to be defined, and no special care needs to be
taken to identify a unique object file used in all builds of a library/program.

All defined functions (if any) are static in each object file, and declared
inline under gcc so they can be more easily eliminated.  Simplifies
maintenance, and worst case should add no more than a few KB to libraries and
programs.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@14291 dc483132-0cff-0310-8789-dd5450dbe970