sasquatch: drop blanket -Werror (fix gcc-11 build) (#139350)
sasquatch: drop blanket -Werror (fix gcc-11 build) (#139350)

Noticed build failure on gcc-11:

    $ nix-build -E 'with import ./.{}; sasquatch.override { stdenv = gcc11Stdenv; }'
    unsquashfs.c:1908:5:
      error: this 'if' clause does not guard... [-Werror=misleading-indentation]
     1908 |     if(swap)
          |     ^~

Let's defer warning squashing and code fixes to upstream.
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