[Bug c++/95700] read-md.c: "missing sentinel in function call" when building gcc with musl

[iii at linux dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95700

--- Comment #5 from Ilya Leoshkevich <iii at linux dot ibm.com> ---
I'm sorry, I should not have written (uintptr_t)0 - I just used it as a synonym
for a "pointer-sized int". Would allowing 0L as a sentinel value be a
reasonable thing?