/usr/i686-w64-mingw32/lib/libruntimeobject.a is in mingw-w64-i686-dev 3.1.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | INPUT(libapi-ms-win-core-winrt-string-l1-1-0.a)
INPUT(libapi-ms-win-core-winrt-l1-1-0.a)
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