[basisu] initial port (#6995)

ports/basisu/CONTROL

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+Source: basisu
+Version: 0.0.1
+Homepage: https://github.com/BinomialLLC/basis_universal
+Description: Basis Universal is a supercompressed GPU texture and video compression format that outputs a highly compressed intermediate file format (.basis) that can be quickly transcoded to a wide variety of GPU texture compression formats. 
+Build-Depends: lodepng

ports/basisu/portfile.cmake

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+include(vcpkg_common_functions)
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO jherico/basis_universal
+    REF 11aa181a4bbf051475a01a1e73e39bf388819215
+    SHA512 62d7de6c6ca5e6235c8a377767389a7d5393e05bb5d0c024ce756e77d235132efa48280c9d529b6a91eddf0c906c3c84b6b78fdf339b1a47039b28d04161d2fe
+    HEAD_REF master
+)
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    OPTIONS
+        -DBUILD_TESTS=OFF
+)
+
+vcpkg_install_cmake()
+
+#vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake/basisu)
+if (WIN32)
+    set(TOOL_NAME basisu_tool.exe)
+else()
+    set(TOOL_NAME basisu_tool)
+endif()
+
+file(COPY ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/basisu)
+file(COPY ${CURRENT_PACKAGES_DIR}/bin/${TOOL_NAME} DESTINATION ${CURRENT_PACKAGES_DIR}/tools/basisu)
+file(RENAME ${CURRENT_PACKAGES_DIR}/share/basisu/LICENSE ${CURRENT_PACKAGES_DIR}/share/basisu/copyright)
+
+vcpkg_copy_tool_dependencies(${CURRENT_PACKAGES_DIR}/tools/basisu)
+
+# Remove unnecessary files
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
+file(REMOVE ${CURRENT_PACKAGES_DIR}/debug/bin/${TOOL_NAME})
+file(REMOVE ${CURRENT_PACKAGES_DIR}/bin/${TOOL_NAME})
+
+if(VCPKG_LIBRARY_LINKAGE STREQUAL static)
+    file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/bin ${CURRENT_PACKAGES_DIR}/debug/bin)
+endif()
+
+vcpkg_copy_pdbs()