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Add `export-map` script #5099

Job	Run time
lint / lint	17s
docs / Build linux64	1m 3s
test / Windows MSVC / Build win64	18m 18s
test / Linux gcc-12 / Build linux64	7m 56s
test / Linux gcc-10 / Build linux64	6m 5s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	56s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	42s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 1s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	57s
	37m 15s

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