Fixup "[analyzer] Propagate taint for wchar variants of some APIs"

Fix build bot: https://lab.llvm.org/buildbot/#/builders/139/builds/49699

clang/test/Analysis/taint-generic.c:
```
Line 100: redefinition of typedef 'size_t' is a C11 feature
Line 59: previous definition is here
```

This commit fixups 61924da6
Committed in this PR: https://github.com/llvm/llvm-project/pull/66074