libbson-1.7.0-0.2.rc1.fc27 ABI change

[Petr Pisar]

Fedora 27 delivers libbson's developmental version for testing purposes.
Now-built libbson-1.7.0-rc1 changed ABI comparing to 1.7.0-rc0. It
renamed bson_as_extended_json() to bson_as_canonical_json().

This shouldn't be any issue for Fedora packages as none of the libbson
libary users were built after introducing bson_as_extended_json():

mongo-c-driver-1.6.3-1.fc27.src.rpm
perl-MongoDB-1.8.0-2.fc27.src.rpm
php-pecl-mongodb-1.2.9-1.fc27.src.rpm
syslog-ng-3.10.1-1.fc27.src.rpm

Because this is still a release candidate, no SONAME was changed either. And
because no packages are affected, no rebuild is necessary. At the end,
the 1.7.0 is ABI-compatible to 1.6.3.

-- Petr