Provide default values in pre.in for PROG_LIBPATH, PROG_RPATH,
SHLIB_DIRS, SHLIB_RDIRS, and STOBJLISTS so that they don't have to be
specified in the common case.  Rename KRB5_RUN_ENV and KRB5_RUN_VARS
to RUN_SETUP (already the most commonly used name) and RUN_VARS.  Make
sure to use DEFINES for local defines (not DEFS).  Remove some other
unnecessary makefile content.

On many Linux systems, due to what is arguably a bug in rpcbind, the
portmapper doesn't allow service registration from non-root processes.
This causes the RPC tests to be frequently skipped.  Modify the tests
so that they don't need the portmapper, by grabbing the port number
from the server process and passing it to the client.

The "expired" test in expire.exp tries to authenticate to the server
process with an expired TGT (obtained using kinit -l -1m).  Using an
expired TGT to get an expired service cred no longer works after
#6948.  We could use kinit -S to get an expired service cred, but
krb5_get_credentials won't return expired service cred from the cache
(even before #6948).  We could use time offsets to simulate clock skew
between the client and server process, but that would be difficult
because the test programs don't have access to the krb5_context
objects used by the client or server process.  Since we don't have a
simple workaround, disable the test.

Mostly this gets rid of the trailing space on line 2 after
bb76891f5386526bdf91bc790c614fc9296cb5fa.

gssrpc raw services could not work because svcraw_create did not set
svcraw_private after allocating memory for it.

[ghudson@mit.edu: commit message, patch splitting]

ticket: 7534

clntraw_create has been broken since inception; on the first call, it
would compute invalid values of xdrs and client and dereference them.
Fix that.  (This is pretty strong evidence that no one has ever used
it.)  Reported by Nickolai Zeldovich <nickolai@csail.mit.edu>.

ticket: 7511

Use free() instead of gss_release_buffer() when freeing buffers in
libgssrpc which weren't constructed by GSSAPI.  This mixing is
harmless in normal configurations (since libgssrpc is only used on
Unix), but fails with DEBUG_GSSALLOC.

The gid_len length is declared as an unsigned int, and loop
index 'i' is a signed int.  This could manifest as an infinite
loop if gid_len is very large.  In practice, gid_len should be small,
but make 'i' the same type for consistency.

The %*s format takes two arguments, a precision length/width and
an actual string; the length is specified as a signed integer.
The size_t length field of the gss_buffer_desc type is an unsigned
type, which must be cast or otherwise converted to a signed type
to match the format string expectations.
I do not think that the length will approach SIZE_T_MAX in practice,
due to buffer constraints, so do not include handling for the
edge case.

There is a '%zu' format string for printing size_ts, but it is not
available everywhere (e.g., AIX).  Instead, use the
unsigned long long abomination.