Add ktx

ktx/LICENSES/LicenseRef-Kodak.txt

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+This LICENSES file applies to images from the Kodak Lossless True Color
+Image Suite, and exists only for REUSE compliance. According to
+http://r0k.us/graphics/kodak/ , for such images:
+
+"It is my understanding they have been released by the Eastman Kodak Company
+for unrestricted usage. Many sites use them as a standard test suite for
+compression testing, etc."