Makefile.in, configure.in, krb5.hin: Move krb5.h to krb5.hin,

Makefile.in, configure.in, krb5.hin: Move krb5.h to krb5.hin,
	and build krb5.h from krb5.hin and the error table
	include files, which are now built in this directory.
	This way, krb5.h is the only include file that we need to
	install.

k5-int.h: Move the sockets specific setup out of k5-config.h to
	  k5-sockets.h, and modify k5-int to include k5-sockets.h
	  (if it is requested by NEED_SOCKETS) after including
	  krb5.h.  This keeps the gdb type numbers the same across
	  .o files, so that recent binuntils can compress the
	  debugging information in executables linked with a
	  debugging library.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@5848 dc483132-0cff-0310-8789-dd5450dbe970