[Sanitizers] Avoid overload ambiguity for interceptors (#100986) Since glibc 2.40 some functions like openat make use of overloads when built with `-D_FORTIFY_SOURCE=2`, see: https://github.com/bminor/glibc/blob/master/io/bits/fcntl2.h This means that doing something like `(uintptr_t) openat` or `(void *) openat` is now ambiguous, breaking the compiler-rt build on new glibc versions. Fix this by explicitly casting the symbol to the expected function type before casting it to an intptr. The expected type is obtained as `decltype(REAL(func))` so we don't have to repeat the signature from INTERCEPTOR in the INTERCEPT_FUNTION macro. Fixes https://github.com/llvm/llvm-project/issues/100754.
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