Windows compatibility

[jakobnissen]

Dear rust-htslib authors,

When cross-compiling another package depending on this to windows, I find that this package errors. Below is a small snippet of the many errors.

I don't see anything in your README that mentions this package only works for Windows, nor anything in the Cargo.toml. Are these compilation issues unintended?

[12:15:56] error[E0308]: mismatched types
[12:15:56]    --> /opt/x86_64-linux-musl/registry/src/github.com-1ecc6299db9ec823/rust-htslib-0.36.0/src/bam/record.rs:154:16
[12:15:56]     |
[12:15:56] 154 |             l: sam_copy.len() as u64,
[12:15:56]     |                ^^^^^^^^^^^^^^^^^^^^^ expected `u32`, found `u64`
[12:15:56] 
[12:15:56]    Compiling bstr v0.2.17
[12:15:56] error[E0308]: mismatched types
[12:15:56]    --> /opt/x86_64-linux-musl/registry/src/github.com-1ecc6299db9ec823/rust-htslib-0.36.0/src/bam/record.rs:155:16
[12:15:56]     |
[12:15:56] 155 |             m: sam_copy.len() as u64,
[12:15:56]     |                ^^^^^^^^^^^^^^^^^^^^^ expected `u32`, found `u64`
[12:15:56] 
[12:15:56]    Compiling bincode v1.3.3
[12:15:56]    Compiling multimap v0.8.3
[12:15:56] error[E0308]: mismatched types
[12:15:56]    --> /opt/x86_64-linux-musl/registry/src/github.com-1ecc6299db9ec823/rust-htslib-0.36.0/src/bam/mod.rs:936:29
[12:15:56]     |
[12:15:56] 936 |             (*rec).l_text = l_text as u64;
[12:15:56]     |             -------------   ^^^^^^^^^^^^^ expected `u32`, found `u64`
[12:15:56]     |             |
[12:15:56]     |             expected due to the type of this binding