Add port for Rasterbar-libtorrent.

ports/libtorrent/CONTROL

@@ -0,0 +1,4 @@
+Source: libtorrent
+Version: 1.1.4
+Description: An efficient feature complete C++ BitTorrent implementation 
+Build-Depends: boost, openssl

ports/libtorrent/add-datetime-to-boost-libs.patch

@@ -0,0 +1,13 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 340e38f..1963d90 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -258,7 +258,7 @@ endif()
+
+ # Boost
+ if(NOT DEFINED Boost_INCLUDE_DIR OR NOT DEFINED Boost_LIBRARIES)
+-	FIND_PACKAGE(Boost REQUIRED COMPONENTS system chrono random)
++	FIND_PACKAGE(Boost REQUIRED COMPONENTS system date_time chrono random)
+ endif()
+ include_directories(${Boost_INCLUDE_DIRS})
+ target_link_libraries(torrent-rasterbar ${Boost_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})

ports/libtorrent/add-dbghelp-to-win32-libs.patch

@@ -0,0 +1,13 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 1963d90..99698a2 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -267,7 +267,7 @@ target_link_libraries(torrent-rasterbar ${Boost_LIBRARIES} ${CMAKE_THREAD_LIBS_I
+ #add_definitions(-DBOOST_ASIO_HASH_MAP_BUCKETS=1021  -D__USE_W32_SOCKETS -DWIN32_LEAN_AND_MEAN )
+
+ if (WIN32)
+-	target_link_libraries(torrent-rasterbar wsock32 ws2_32 Iphlpapi)
++	target_link_libraries(torrent-rasterbar wsock32 ws2_32 Iphlpapi dbghelp)
+ 	add_definitions(-D_WIN32_WINNT=0x0600)
+ 	# prevent winsock1 to be included
+ 	add_definitions(-DWIN32_LEAN_AND_MEAN)

ports/libtorrent/portfile.cmake

@@ -0,0 +1,58 @@
+# Common Ambient Variables:
+#   CURRENT_BUILDTREES_DIR    = ${VCPKG_ROOT_DIR}\buildtrees\${PORT}
+#   CURRENT_PACKAGES_DIR      = ${VCPKG_ROOT_DIR}\packages\${PORT}_${TARGET_TRIPLET}
+#   CURRENT_PORT_DIR          = ${VCPKG_ROOT_DIR}\ports\${PORT}
+#   PORT                      = current port name (zlib, etc)
+#   TARGET_TRIPLET            = current triplet (x86-windows, x64-windows-static, etc)
+#   VCPKG_CRT_LINKAGE         = C runtime linkage type (static, dynamic)
+#   VCPKG_LIBRARY_LINKAGE     = target library linkage type (static, dynamic)
+#   VCPKG_ROOT_DIR            = <C:\path\to\current\vcpkg>
+#   VCPKG_TARGET_ARCHITECTURE = target architecture (x64, x86, arm)
+#
+
+include(vcpkg_common_functions)
+set(SOURCE_PATH ${CURRENT_BUILDTREES_DIR}/src/libtorrent-libtorrent-1_1_4)
+vcpkg_download_distfile(ARCHIVE
+    URLS "https://github.com/arvidn/libtorrent/archive/libtorrent-1_1_4.zip"
+    FILENAME "libtorrent-1_1_4.zip"
+    SHA512 fd3b875c9626721db9b3e719ce50deeb6f39a030df1e23dd421d0b142aac9c3bb7bee3a61f0c18bb30f85d4dd6131fe90d6138c09ba598f09230824f8d5a3fb1
+)
+
+vcpkg_extract_source_archive(${ARCHIVE})
+
+vcpkg_apply_patches(
+    SOURCE_PATH ${SOURCE_PATH}
+    PATCHES ${CMAKE_CURRENT_LIST_DIR}/add-datetime-to-boost-libs.patch
+    PATCHES ${CMAKE_CURRENT_LIST_DIR}/add-dbghelp-to-win32-libs.patch
+)
+
+if (NOT VCPKG_LIBRARY_LINKAGE STREQUAL dynamic)
+    message(FATAL_ERROR "Only dynamic linking supported.")
+endif()
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    PREFER_NINJA # Disable this option if project cannot be built with Ninja
+    OPTIONS
+        -Ddeprecated-functions=off
+)
+
+vcpkg_install_cmake()
+
+if (VCPKG_LIBRARY_LINKAGE STREQUAL dynamic)
+    # Put shared libraries into the proper directory
+    file(MAKE_DIRECTORY ${CURRENT_PACKAGES_DIR}/bin)
+    file(MAKE_DIRECTORY ${CURRENT_PACKAGES_DIR}/debug/bin)
+
+    file(RENAME ${CURRENT_PACKAGES_DIR}/lib/torrent-rasterbar.dll ${CURRENT_PACKAGES_DIR}/bin/torrent-rasterbar.dll)
+    file(RENAME ${CURRENT_PACKAGES_DIR}/debug/lib/torrent-rasterbar.dll ${CURRENT_PACKAGES_DIR}/debug/bin/torrent-rasterbar.dll)
+else()
+
+endif()
+
+# Handle copyright
+file(COPY ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/libtorrent)
+file(RENAME ${CURRENT_PACKAGES_DIR}/share/libtorrent/LICENSE ${CURRENT_PACKAGES_DIR}/share/libtorrent/copyright)
+
+# Do not duplicate include files
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)