Add WT_EXTENSION_API::strerror so extensions don't have to load against
the WiredTiger library in order to get to wiredtiger_strerror().
Merge branch 'develop' into stec
Add WT_EXTENSION_API::strerror so extensions don't have to load against
the WiredTiger library in order to get to wiredtiger_strerror().

Back out the change to kvs_bdb/Makefile.am that loaded it against the
WiredTiger library.