Merge branch 'klg/more-cross-linux-windows-subtleties' into 'master'

regtests: Adjust discriminant for Windows host

See merge request eng/toolchain/aws!15

Author: peniblec

regtests/0265_wsdl_derived_constraints/test.opt

@@ -1,2 +1,3 @@
 !xmlada DEAD
-windows OUT test-win.out
+--  Line number discrepancy, see eng/toolchain/aws#20.
+windows-host OUT test-win.out