[CMake] file(SHA1) vs string(SHA1) consistency

[Ruslan Baratov]

Hi,

Following code produce same SHA1 on Linux:

    cmake_minimum_required(VERSION 3.0)

    set(test_string "a\nb")
    set(test_file "test.file")

    string(SHA1 sha1_string "${test_string}")

    file(WRITE "${test_file}" "${test_string}")
    file(SHA1 "${test_file}" sha1_file)

    message("sha1:")
    message("  ${sha1_file}")
    message("  ${sha1_string}")

result:

    sha1:
       fcd127ffa1016069006ad91f3f361248f9bdf272
       fcd127ffa1016069006ad91f3f361248f9bdf272

but not same SHA1 on Windows:

    sha1:
       ec6cb5b8c69f8b476a380c9b6e38e18c2733ae7b
       fcd127ffa1016069006ad91f3f361248f9bdf272

I think this is because of DOS end of lines. Two thoughts:
* file(SHA1) and string(SHA1) should be the same on same input string
* since CMake is a cross-platform tool I think it make sense that 
command `file(WRITE "..." "a\nb")` produce identical files on all platforms
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