GHA: Run tests for i686-w64-mingw32 host #818

Job	Run time
build-cross (x86_64-w64-mingw32)	1m 16s
build-windows (x86)	1m 23s
build-cross (i686-w64-mingw32)	1m 48s
build-windows (x64)	44s
build (ubuntu-24.04, gcc, autotools)	39s
build (ubuntu-24.04, gcc, cmake)	41s
build (ubuntu-24.04, clang, autotools)	1m 13s
build (ubuntu-24.04, clang, distcheck)	53s
build (ubuntu-24.04, clang, cmake)	1m 0s
build (macos-13, gcc, autotools)	1m 27s
build (macos-13, gcc, cmake)	1m 42s
build (macos-13, clang, autotools)	1m 8s
build (macos-13, clang, cmake)	1m 32s
build (macos-14, gcc, autotools)	59s
build (macos-14, gcc, cmake)	42s
build (macos-14, clang, autotools)	42s
build (macos-14, clang, cmake)	43s
release	0s
	18m 32s

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