Update to rra-c-util 5.7 and C TAP Harness 4.1

Update to rra-c-util 5.7 and C TAP Harness 4.1

Update to rra-c-util 6.2:

* Use calloc in preference to malloc wherever appropriate.
* Use reallocarray in preference to realloc wherever appropriate.
* Suppress warnings from Kerberos headers under make warnings.
* Support the embedded Kerberos in Solaris 10 in library probes.
* Add missing va_end in xasprintf implementation.
* Fix logic in Test::RRA::Automake for new Automake dist checking.
* Fix all return-value checks for snprintf to avoid off-by-one error.
* Update warning flags for make warnings to GCC 6.1.0.
* Fix Test::RRA::Config for new "do" semantics in Perl 5.22.2.
* Add a new test for obsolete eyrie.org URLs.
* Require Test::Strict 0.25 or newer for Perl strictness checks.

Update to C TAP Harness 4.1:

* Replace all remaining uses of sprintf.
* Test lists may now have comments and blank lines.
* runtests -v will show the complete output from a test.
* Fix segfault in runtests when given an empty test list.
* Tests use C_TAP_SOURCE and C_TAP_BUILD instead of SOURCE and BUILD.