Use HTTPS

[xkszltl]

These 2 files are downloaded for unit tests.

utf8proc/CMakeLists.txt

Lines 68 to 69 in b5211c8

	file(DOWNLOAD http://www.unicode.org/Public/${UNICODE_VERSION}/ucd/NormalizationTest.txt data/NormalizationTest.txt SHOW_PROGRESS)
	file(DOWNLOAD http://www.unicode.org/Public/${UNICODE_VERSION}/ucd/auxiliary/GraphemeBreakTest.txt data/GraphemeBreakTest.txt SHOW_PROGRESS)

Since server support https, should we use that instead?
In case you want to support cmake built without openssl, maybe we can have an option to decide the prefix.
Also, if https is used, recommend to expose CMAKE_TLS_VERIFY as an option and default to ON.

[stevengj]

Sure, can you file a PR to use https in CMakeLists and the Makefiles?

[xkszltl]

OK, will find a time slot for it.

[xkszltl]

Before I move forward, could you clarify if you were intentionally keeping compatibility for edge cases like special cmake without openssl?
If not I can simply add a s.

[stevengj]

No, just add an s.