Bug#914622: foobillardplus FTCBFS: uses the wrong pkg-config

[Helmut Grohne]

Source: foobillardplus
Version: 3.43~svn170+dfsg-5
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

The patch that fixed #892338 in 3.43~svn170+dfsg-5 regressed cross
building, because it improperly uses pkg-config and thus uses the wrong
one. The attached patch defers discovery of pkg-config to autotools and
thus makes foobillardplus cross build successfully again. Please
consider applying it.

Helmut