Add MacVim-specific settings to .editorconfig #786

Job	Run time
build-and-test (macos-13, 15.2, vimtags, check-xcodeproj-compat)	12m 59s
build-and-test (macos-13, 15.2, vimtags, check-xcodeproj-compat)	41m 25s
build-and-test (macos-14, 15.4, true)	35m 51s
build-and-test (macos-14, 15.4, true)	35m 51s
build-and-test (macos-15, 16.2, true, true)	43m 20s
build-and-test (macos-15, 16.2, true, true)	43m 20s
	3h 32m 46s

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