musl uses an `int` instead of a `unsigend long` for the ioctl function
prototype, contrary to glibc, since POSIX mandates the former. This
causes a spurious error on ppc64le which can be silenced by casting to
int explicitly.

See https://www.openwall.com/lists/musl/2020/01/20/2

--- ccache-4.4.2.orig/src/Util.cpp	2021-09-28 21:39:22.000000000 +0200
+++ ccache-4.4.2/src/Util.cpp	2021-11-05 16:16:59.972620042 +0100
@@ -253,7 +253,7 @@ clone_file(const std::string& src, const
     }
   }
 
-  if (ioctl(*dest_fd, FICLONE, *src_fd) != 0) {
+  if (ioctl(*dest_fd, (int)FICLONE, *src_fd) != 0) {
     throw core::Error(strerror(errno));
   }