Reduce build-time per-system dependencies and krb5.h namespace intrusions

Reduce build-time per-system dependencies and krb5.h namespace intrusions

* krb5.hin: Don't include profile.h.  Do include limits.h.
(krb5_int16, krb5_ui_2, krb5_int32, krb5_ui_4): Conditionalize on the values of
INT_MAX, LONG_MAX and SHRT_MAX.
(VALID_INT_BITS, VALID_UINT_BITS, SALT_TYPE_AFS_LENGTH, SALT_TYPE_NO_LENGTH):
Define in terms of INT_MAX and UINT_MAX.
(struct _profile_t): Declare forward.
(krb5_get_profile): Use struct _profile_t instead of profile_t in declaration.
(krb5_ui_1): Delete.
* Makefile.in (krb5.h): Don't put SIZEOF macros into output.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@14451 dc483132-0cff-0310-8789-dd5450dbe970