Correct calling convention for invoking ICU50 methods
Correct calling convention for invoking ICU50 methods

Without this debugger complains about unbalanced stack. Probably that will
cause a user-observable problem at some point.

sillsdev/icu-dotnet,sillsdev/icu-dotnet,conniey/icu-dotnet,ermshiperete/icu-dotnet,conniey/icu-dotnet,ermshiperete/icu-dotnet