fix: daemon scheme_root/create_this_scheme_fd error conversion

Fix 4 E0277 errors in daemon/src/lib.rs where scheme_root()
and create_this_scheme_fd() return syscall::error::Error but
the function returns syscall::Error. Add .map_err() conversions.

redox-driver-sys errors (6 remaining E0308/E0061 in dma.rs/io.rs)
are pre-existing API mismatches between libredox and redox_syscall
crate versions — not addressed here.

recipes/dev/python312/recipe.toml

@@ -40,6 +40,8 @@ if [ "$TARGET" != "$COOKBOOK_HOST_TARGET" ]; then
     )
 else
     COOKBOOK_CONFIGURE_FLAGS=(--prefix=/usr)
+    # redoxer host sysroot may not define LONG_BIT via <limits.h>
+    export CFLAGS="${CFLAGS:-} -DLONG_BIT=64"
 fi
 
 if [ "${COOKBOOK_DYNAMIC}" != "1" ]; then