Drop support for pre-1.4 Xapian, prepare for 1.5.x

[David Bremner]

David Bremner <david at tethera.net> writes:

> David Bremner <david at tethera.net> writes:
>
>>
>> I forgot, there's one other failing test with xapian 1.5
>>
>> T650-regexp-query: Testing regular expression searches
>>  FAIL   null from: search
>> 	--- T650-regexp-query.7.EXPECTED	2019-04-15 11:03:10.128070898 +0000
>> 	+++ T650-regexp-query.7.OUTPUT	2019-04-15 11:03:10.128070898 +0000
>> 	@@ -1 +0,0 @@
>> 	-thread:XXX   2001-01-05 [1/1] -; empty from (inbox unread)
>
> I'm continuing to investigate this. The following program finds one
> result (in tmp.T650-regexp-query) in 1.4 and 0 results in Xapian
> master. I'd give about 50% odds that I'm just doing something silly.
>

This turned out to be a Xapian bug, fixed in commit f513d191f9e6.

Thanks to Olly Betts for the quick fix.

d