Add libssh2.

ports/libssh2/CONTROL

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+Source: libssh2
+Version: 1.8.0
+Build-Depends: zlib, openssl
+Description: The SSH library

ports/libssh2/LICENSE

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+/* Copyright (c) 2004-2007 Sara Golemon <sarag@libssh2.org>
+ * Copyright (c) 2005,2006 Mikhail Gusarov <dottedmag@dottedmag.net>
+ * Copyright (c) 2006-2007 The Written Word, Inc.
+ * Copyright (c) 2007 Eli Fant <elifantu@mail.ru>
+ * Copyright (c) 2009-2014 Daniel Stenberg
+ * Copyright (C) 2008, 2009 Simon Josefsson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms,
+ * with or without modification, are permitted provided
+ * that the following conditions are met:
+ *
+ *   Redistributions of source code must retain the above
+ *   copyright notice, this list of conditions and the
+ *   following disclaimer.
+ *
+ *   Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials
+ *   provided with the distribution.
+ *
+ *   Neither the name of the copyright holder nor the names
+ *   of any other contributors may be used to endorse or
+ *   promote products derived from this software without
+ *   specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ */

ports/libssh2/portfile.cmake

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+include(vcpkg_common_functions)
+set(SOURCE_PATH ${CURRENT_BUILDTREES_DIR}/src/libssh2-1.8.0)
+vcpkg_download_distfile(ARCHIVE_FILE
+    URLS "https://www.libssh2.org/download/libssh2-1.8.0.tar.gz"
+    FILENAME "libssh2-1.8.0.tar.gz"
+    SHA512 289aa45c4f99653bebf5f99565fe9c519abc204feb2084b47b7cc3badc8bf4ecdedd49ea6acdce8eb902b3c00995d5f92a3ca77b2508b92f04ae0e7de7287558
+)
+vcpkg_extract_source_archive(${ARCHIVE_FILE})
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    OPTIONS
+        -DBUILD_EXAMPLES=OFF
+        -DBUILD_TESTING=OFF
+        -DENABLE_ZLIB_COMPRESSION=ON
+    OPTIONS_DEBUG
+        -DENABLE_DEBUG_LOGGING=OFF
+)
+
+vcpkg_install_cmake()
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/lib/cmake)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/share)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/lib/cmake)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/lib/pkgconfig)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/share)
+
+file(INSTALL ${CMAKE_CURRENT_LIST_DIR}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/libssh2 RENAME copyright)
+
+vcpkg_copy_pdbs()