Strange native compilation error on travis

I cannot reproduce this locally:

```
> haxe -cs bin/cs/ -lib travix -lib mithril tests.hxml
haxelib run hxcs hxcs_build.txt --haxe-version 3407 --feature-level 1
Note: dmcs is deprecated, please use mcs instead!
src/buddy/Should.cs(829,84): error CS1525: Unexpected symbol `<'
src/buddy/Should.cs(829,130): error CS1525: Unexpected symbol `('
src/buddy/Should.cs(971,254): error CS1525: Unexpected symbol `<'
src/buddy/Should.cs(971,254): error CS1525: Unexpected symbol `)', expecting `;' or `}'
src/buddy/Should.cs(971,254): error CS1525: Unexpected symbol `,', expecting `;' or `}'
src/buddy/Should.cs(971,254): error CS1525: Unexpected symbol `,', expecting `;' or `}'
src/buddy/Should.cs(971,254): error CS1525: Unexpected symbol `)', expecting `;' or `}'
src/buddy/Should.cs(977,254): error CS1525: Unexpected symbol `>'
src/buddy/Should.cs(977,254): error CS1525: Unexpected symbol `)', expecting `;' or `}'
src/buddy/Should.cs(977,254): error CS1525: Unexpected symbol `,', expecting `;' or `}'
src/buddy/Should.cs(977,254): error CS1525: Unexpected symbol `,', expecting `;' or `}'
src/buddy/Should.cs(977,254): error CS1525: Unexpected symbol `)', expecting `;' or `}'
src/buddy/Should.cs(1318,28): error CS1525: Unexpected symbol `<'
src/buddy/Should.cs(1318,54): error CS1525: Unexpected symbol `<'
src/buddy/Should.cs(1320,9): error CS1525: Unexpected symbol `ShouldIterable', expecting `class', `delegate', `enum', `interface', `partial', or `struct'
src/buddy/Should.cs(1320,54): error CS1525: Unexpected symbol `empty'
src/buddy/Should.cs(1320,103): error CS1525: Unexpected symbol `)'
src/buddy/Should.cs(1324,9): error CS1525: Unexpected symbol `ShouldIterable', expecting `class', `delegate', `enum', `interface', `partial', or `struct'
Compilation failed: 18 error(s), 0 warnings
Compilation error
Native compilation failed
```

The whole build is here: https://travis-ci.org/ciscoheat/mithril-hx/jobs/374918804#L1912-L1933