[letor] Link tests against xapian-core found by configure
commitf152c5c0f1a01a5147a146bb681850d0038ec52f
authorOlly Betts <olly@survex.com>
Tue, 23 May 2017 23:29:04 +0000 (24 11:29 +1200)
committerOlly Betts <olly@survex.com>
Tue, 23 May 2017 23:29:04 +0000 (24 11:29 +1200)
tree344fe85f84b5d9be762f76b5c50f3a264ee54b67
parent08002c6d87358977a6427665f2fa5e9e290aa002
[letor] Link tests against xapian-core found by configure

Previously we assumed we were building as part of a combined tree.

Indirectly fixes assumption that the xapian-core library is called
libxapian.la, reported by Ayush Pandey on IRC.
xapian-letor/tests/Makefile.am