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cmake: fix build with GCC's UBSan

GNU GCC compiler has UndefinedBehaviour sanitizer support since
4.9.0 [1], but it was unsupported in tarantool's build. The patch
fixes a build by GNU GCC with enabled UBSan.

1. https://gcc.gnu.org/gcc-4.9/changes.html

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(cherry picked from commit 511e0f50e)

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