Add zstd port

ports/zstd/CONTROL

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+Source: zstd
+Version: 1.1.1
+Description: Zstandard - Fast real-time compression algorithm http://www.zstd.net

ports/zstd/portfile.cmake

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+include(vcpkg_common_functions)
+set(SOURCE_PATH ${CURRENT_BUILDTREES_DIR}/src/zstd-1.1.1)
+vcpkg_download_distfile(ARCHIVE
+    URLS "https://github.com/facebook/zstd/archive/v1.1.1.zip"
+    FILENAME "zstd-1.1.1.zip"
+    SHA512 c96a97519202a759c62f661c7bbaeaa0d48e4e78588a8232ad23fd78fe7c3440f1f07d996dcf07daa652569e1c5e39cb7b93103b9ec7845db05b161ec29a8dde
+)
+vcpkg_extract_source_archive(${ARCHIVE})
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}/build/cmake
+    OPTIONS -DZSTD_LEGACY_SUPPORT=1
+)
+
+vcpkg_build_cmake()
+
+# Manual install since zstd guarded all their installation functions behind an if (UNIX)
+message(STATUS "Installing")
+
+file(COPY ${SOURCE_PATH}/lib/zstd.h DESTINATION ${CURRENT_PACKAGES_DIR}/include)
+file(COPY ${SOURCE_PATH}/lib/common/zbuff.h DESTINATION ${CURRENT_PACKAGES_DIR}/include)
+file(COPY ${SOURCE_PATH}/lib/dictBuilder/zdict.h DESTINATION ${CURRENT_PACKAGES_DIR}/include)
+
+# Copy the command-line zstd exe
+file(INSTALL ${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/programs/Release/
+    DESTINATION ${CURRENT_PACKAGES_DIR}/tools
+    FILES_MATCHING PATTERN "zstd.exe")
+
+if (VCPKG_LIBRARY_LINKAGE STREQUAL dynamic)
+    # Dynamic libs of zstd appear to start with "zstdlib."
+    file(INSTALL ${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/lib/Release/
+        DESTINATION ${CURRENT_PACKAGES_DIR}/lib
+        FILES_MATCHING PATTERN "zstdlib.*.lib")
+    file(INSTALL ${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/lib/Release/
+        DESTINATION ${CURRENT_PACKAGES_DIR}/bin
+        FILES_MATCHING PATTERN "zstdlib.*.dll")
+    file(INSTALL ${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg/lib/Debug/
+        DESTINATION ${CURRENT_PACKAGES_DIR}/debug/lib
+        FILES_MATCHING PATTERN "zstdlib.*.lib")
+    file(INSTALL ${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg/lib/Debug/
+        DESTINATION ${CURRENT_PACKAGES_DIR}/debug/bin
+        FILES_MATCHING PATTERN "zstdlib.*.dll")
+else()
+    # Static libs of zstd appear to start with "zstdlib_"
+    file(INSTALL ${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/lib/Release/
+        DESTINATION ${CURRENT_PACKAGES_DIR}/lib
+        FILES_MATCHING PATTERN "zstdlib_*.lib")
+    file(INSTALL ${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg/lib/Debug/
+        DESTINATION ${CURRENT_PACKAGES_DIR}/debug/lib
+        FILES_MATCHING PATTERN "zstdlib_*.lib")
+endif()
+
+# Handle copyright
+file(COPY ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/zstd)
+file(RENAME ${CURRENT_PACKAGES_DIR}/share/zstd/LICENSE ${CURRENT_PACKAGES_DIR}/share/zstd/copyright)
+
+vcpkg_copy_pdbs()
+message(STATUS "Installing done")