Fix HAVE_TRUNC cmake check

Review Request #129119 - Created Oct. 7, 2016 and submitted

Information
Albert Astals Cid
kdelibs
KDE/4.14
Reviewers
buildsystem, kdelibs

On newer distros the check fails because trunc is ambiguous, so tell sizeof exactly which trunc we're speaking about.

kdelibs compiles (a bit more, there's still an unrelated issue)

Aleix Pol Gonzalez
Ralf Habacker
Albert Astals Cid
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit 0c642ae95dacf894e50630ffcc1961ad1e4e0322 by Albert Astals Cid to branch KDE/4.14.
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