Fix linking of test programs on msys

[d0p1s4m4]

Mostly related to: #1749 and #1751

• [NO] Does this PR change the input/output behaviour of a cryptographic algorithm (i.e., does it change known answer test values)? (If so, a version bump will be required from x.y.z to x.(y+1).0.)
• [NO] Does this PR change the list of algorithms available -- either adding, removing, or renaming? Does this PR otherwise change an API? (If so, PRs in fully supported downstream projects dependent on these, i.e., oqs-provider will also need to be ready for review and merge by the time this is merged.)

[baentsch]

Thanks for this improvement to the msys toolchain!

[SWilson4]

Thank you very mcuh for the contribution @d0p1s4m4! Sorry to cause trivial work for you, but would you please address the failing DCO check? It should just be a matter of committing with the -s option.

[d0p1s4m4]

@SWilson4 done

[SWilson4]

Thank you very much!