[BUG] Package mingw64-x86_64-icu is broken

[Stefan Weil]

Both mingw64-x86_64-icu-57.1-1 and mingw64-x86_64-icu-57.1-2 are broken:

This code always fails:

icu::Normalizer2::getInstance(nullptr, "nfkc", UNORM2_COMPOSE, error_code);

The problem was detected when comparing Tesseract for Windows
executables: while the 32 bit version worked fine, the 64 bit version
failed. The failure could be localized, and the mingw64-x86_64-icu
package was identified to be causing it.

https://github.com/tesseract-ocr/tesseract/issues/1625#issuecomment-395161152
contains details and also a short test code which can be used to
reproduce the problem.

The 32 bit package mingw64-i686-icu-57.1-2 works fine.

Kind regards
Stefan Weil

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