gh-143632: Disable PR_SET_VMA_ANON_NAME on musl libc

[priyanshu2282-cyber]

On Alpine Linux (musl libc), enabling PR_SET_VMA_ANON_NAME can cause build failures due to redefinition of
struct prctl_mm_map.
musl libc redefines this struct in sys/prctl.h, which conflicts with linux/prctl.h. The configure check for PR_SET_VMA_ANON_NAME is not realiable on musl and may pass on
some architectures but fail later during build.
This change disables the feature detection on musl to avoid the header conflict and keep the build behavior consistent.
Note: configure was not regenerated locally since CPython
does not support autoreconf on macOS.

Fixes gh-143632.

[bedevere-app]

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