f4461530fa
This reverts commit 3f8aeb2fb27ea6593dd22576d4d0c4e769a11c59.
`lib/ghc-8.10.7/unix-2.7.2.2/libHSunix-2.7.2.2-ghc8.10.7.so` continues
referencing libc symbols, i.e. `sem_{open,close,unlink}`, regardless of
declarations in `<semaphore.h>`.
%ci:no-build