New review comment by aurieh on void-packages repository

https://github.com/void-linux/void-packages/pull/25878#discussion_r511674166

Comment:
D does not use C headers. I tried to track down the declaration of `vfork` in glibc druntime, which led me to https://github.com/dlang/druntime/blob/master/src/core/sys/posix/unistd.d#L2451 but declaring `vfork` here https://github.com/dlang/druntime/blob/master/src/core/sys/posix/unistd.d#L2479 (in the bootstrap compiler's druntime, of course) did not help, which leads me to believe the musl block is never evaluated thanks to D toolchain's poor support of anything other than x86_64 glibc.