purpose of `LIBICONV_STATIC` and `USING_STATIC_LIBICONV`?

[kambala-decapitator]

what's the point of these compile definitions? They aren't used anywhere in code. Some legacy stuff that's no longer needed?

innoextract/cmake/Findiconv.cmake

Line 88 in 6e9e34e

set(iconv_DEFINITIONS -DLIBICONV_STATIC -DUSING_STATIC_LIBICONV)