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[analyzer] pr34779: CStringChecker: Accept non-standard headers.

Authored by dergachev.a on Nov 7 2017, 2:51 AM.

Description

[analyzer] pr34779: CStringChecker: Accept non-standard headers.

Do not crash when trying to define and call a non-standard
strcpy(unsigned char *, unsigned char *) during analysis.

At the same time, do not try to actually evaluate the call.

Differential Revision: https://reviews.llvm.org/D39422

llvm-svn: 317565