Fix HAVE_TRUNC cmake check

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

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)

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