fbc7955d72
Without the change the build fails on `clang-16` and upcoming `gcc-14`
as:
$ nix build --impure --expr 'with import ./. {}; libimobiledevice.override { stdenv = clangStdenv; }' -L
...
libimobiledevice> #define __usleep(x) usleep(x)
libimobiledevice> ^
libimobiledevice> idevicedevmodectl.c:416:6: error: call to undeclared function 'usleep'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]