Export curl_easy_impersonate API (#63) #187

Job	Run time
(macOS x86_64) Build curl-impersonate and run the tests	2m 19s
(macOS x86_64) Build curl-impersonate and run the tests	2m 19s
(x86_64-linux-gnu) Build curl-impersonate and run the tests	3m 37s
(x86_64-linux-gnu) Build curl-impersonate and run the tests	3m 37s
(macOS arm64) Build curl-impersonate and run the tests	1m 30s
(macOS arm64) Build curl-impersonate and run the tests	1s
(x86_64-linux-musl) Build curl-impersonate and run the tests	4m 43s
(x86_64-linux-musl) Build curl-impersonate and run the tests	4m 43s
(i386-linux-gnu) Build curl-impersonate and run the tests	3m 46s
(i386-linux-gnu) Build curl-impersonate and run the tests	3m 46s
(aarch64-linux-gnu) Build curl-impersonate and run the tests	4m 23s
(aarch64-linux-gnu) Build curl-impersonate and run the tests	4m 23s
(aarch64-linux-musl) Build curl-impersonate and run the tests	4m 45s
(aarch64-linux-musl) Build curl-impersonate and run the tests	4m 45s
(arm-linux-gnueabihf) Build curl-impersonate and run the tests	55s
(arm-linux-gnueabihf) Build curl-impersonate and run the tests	55s
	50m 27s

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