FindLibSpectre: Use FindPkgConfig instead of UsePkgConfig

Review Request #123394 - Created April 17, 2015 and submitted

Information
Heiko Becker
cantor
Applications/15.04, master
346283
Reviewers
kdeedu
filipesaraiva
The latter is deprecated and doesn't respect the PKG_CONFIG
environment variable which makes it easy to deal with differently
named pkg-config executables, e.g. arch-prefixed ones.
Configured and built cantor successfully and checked that it links to libspectre.
Heiko Becker
Filipe Saraiva
Heiko Becker
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit 6a57ff8a5267a5b5d88efb340a146b53b2542505 by Heiko Becker to branch master.
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