[sanitizer] Avoid needless use of stringification (#symver) in INTERCEPT_FUNCTION_VER.

This is a workaround for clang-format bug (PR17874).


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@194468 91177308-0d34-0410-b5e6-96231b3b80d8