GHA: Run tests for i686-w64-mingw32 host #819

Job	Run time
build-windows (x86)	1m 17s
build-cross (x86_64-w64-mingw32)	1m 6s
build-windows (x64)	1m 11s
build (ubuntu-24.04, gcc, autotools)	45s
build-cross (i686-w64-mingw32)	2m 20s
build (ubuntu-24.04, gcc, cmake)	44s
build (ubuntu-24.04, clang, autotools)	1m 19s
build (ubuntu-24.04, clang, distcheck)	57s
build (ubuntu-24.04, clang, cmake)	44s
build (macos-13, gcc, autotools)	1m 27s
build (macos-13, gcc, cmake)	1m 25s
build (macos-13, clang, autotools)	1m 11s
build (macos-13, clang, cmake)	1m 24s
build (macos-14, gcc, autotools)	40s
build (macos-14, gcc, cmake)	43s
build (macos-14, clang, autotools)	39s
build (macos-14, clang, cmake)	43s
release	0s
	18m 35s

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