SafteyErrors for `kernel-headers_linux-64` (on WSL)

From an install today into WSL (not sure if relevant, but it seems the [CI](https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=744238&view=results) from #50 does not show any):
```
SafetyError: The package for kernel-headers_linux-64 located at /mnt/e/miniconda/pkgs/kernel-headers_linux-64-2.6.32-he073ed8_16
appears to be corrupted. The path 'x86_64-conda-linux-gnu/sysroot/usr/include/linux/netfilter/xt_CONNMARK.h'
has an incorrect size.
reported size: 646 bytes
actual size: 542 bytes

SafetyError: The package for kernel-headers_linux-64 located at /mnt/e/miniconda/pkgs/kernel-headers_linux-64-2.6.32-he073ed8_16
appears to be corrupted. The path 'x86_64-conda-linux-gnu/sysroot/usr/include/linux/netfilter/xt_MARK.h'
has an incorrect size.
reported size: 157 bytes
actual size: 149 bytes

SafetyError: The package for kernel-headers_linux-64 located at /mnt/e/miniconda/pkgs/kernel-headers_linux-64-2.6.32-he073ed8_16
appears to be corrupted. The path 'x86_64-conda-linux-gnu/sysroot/usr/include/linux/netfilter/xt_RATEEST.h'
has an incorrect size.
reported size: 305 bytes
actual size: 774 bytes

SafetyError: The package for kernel-headers_linux-64 located at /mnt/e/miniconda/pkgs/kernel-headers_linux-64-2.6.32-he073ed8_16
appears to be corrupted. The path 'x86_64-conda-linux-gnu/sysroot/usr/include/linux/netfilter/xt_TCPMSS.h'
has an incorrect size.
reported size: 172 bytes
actual size: 190 bytes

SafetyError: The package for kernel-headers_linux-64 located at /mnt/e/miniconda/pkgs/kernel-headers_linux-64-2.6.32-he073ed8_16
appears to be corrupted. The path 'x86_64-conda-linux-gnu/sysroot/usr/include/linux/netfilter/xt_dscp.h'
has an incorrect size.
reported size: 638 bytes
actual size: 634 bytes

SafetyError: The package for kernel-headers_linux-64 located at /mnt/e/miniconda/pkgs/kernel-headers_linux-64-2.6.32-he073ed8_16
appears to be corrupted. The path 'x86_64-conda-linux-gnu/sysroot/usr/include/linux/netfilter_ipv4/ipt_ECN.h'
has an incorrect size.
reported size: 824 bytes
actual size: 672 bytes

SafetyError: The package for kernel-headers_linux-64 located at /mnt/e/miniconda/pkgs/kernel-headers_linux-64-2.6.32-he073ed8_16
appears to be corrupted. The path 'x86_64-conda-linux-gnu/sysroot/usr/include/linux/netfilter_ipv4/ipt_ttl.h'
has an incorrect size.
reported size: 350 bytes
actual size: 294 bytes

SafetyError: The package for kernel-headers_linux-64 located at /mnt/e/miniconda/pkgs/kernel-headers_linux-64-2.6.32-he073ed8_16
appears to be corrupted. The path 'x86_64-conda-linux-gnu/sysroot/usr/include/linux/netfilter_ipv6/ip6t_hl.h'
has an incorrect size.
reported size: 377 bytes
actual size: 327 bytes
```

It's interesting that all affected headers are under `include/linux/netfilter`.