- Ensure multibuild flavors result in different src names.

- c-ares 1.26.0:
* Event Thread support. Integrators are no longer required to
monitor the file descriptors registered by c-ares for events
and call ares_process() when enabling the event thread feature
via ARES_OPT_EVENT_THREAD passed to ares_init_options().
* Added flags to are_dns_parse() to force RAW packet parsing
* Mark ares_fds() as deprecated
* Bug fixes
- move tests into a build flavor to avoid gtest/gmock build loop

- Update to version 1.25
Changes:
o Rewrite ares_strsplit() as a wrapper for ares__buf_split() for memory
safety reasons.
o The ahost utility now uses ares_getaddrinfo() and returns both IPv4 and
IPv6 addresses by default.
Bug Fixes:
o Tests: Live reverse lookups for Google's public DNS servers no longer
return results, replace with CloudFlare pubic DNS servers.
o Connection failures should increment the server failure count first or a
retry might be enqueued to the same server
o On systems that don't implement the ability to enumerate network interfaces
the stubs used the wrong prototype.
o Fix minor warnings and documentation typos
o Fix support for older GoogleTest versions
o getrandom() may require sys/random.h on some systems.
o Fix building tests with symbol hiding enabled.
- 0001-Use-RPM-compiler-options.patch: dropped, obsolete