add libcopp (microsoft#4918)

* add libcopp

* [libcopp] Disable ninja due to asm issue. Tweak/install usage file. Prefer static linking over CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS. Use vcpkg_fixup_cmake_targets.

ports/libcopp/CONTROL

@@ -0,0 +1,3 @@
+Source: libcopp
+Version: 1.1.0-1
+Description: A cross-platfrom coroutine library for C++

ports/libcopp/portfile.cmake

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+include(vcpkg_common_functions)
+
+vcpkg_check_linkage(ONLY_STATIC_LIBRARY)
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO owt5008137/libcopp
+    REF 1.1.0
+    SHA512 27b444d158281786154830c6e216e701ba0301af1d7a08873b33e27ce3d2db6ddb4753239878633f4c2aed9f759b46f961408a2eb7b50b5d445c3531c1fa9546
+    HEAD_REF v2
+)
+
+# Use libcopp's own build process, skipping examples and tests
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    # PREFER_NINJA # Disabled because Ninja does not invoke masm correctly for this project
+)
+vcpkg_install_cmake()
+
+file(MAKE_DIRECTORY ${CURRENT_PACKAGES_DIR}/share/libcopp)
+file(COPY ${CMAKE_CURRENT_LIST_DIR}/usage DESTINATION ${CURRENT_PACKAGES_DIR}/share/libcopp)
+file(COPY ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/libcopp)
+file(COPY ${SOURCE_PATH}/BOOST_LICENSE_1_0.txt DESTINATION ${CURRENT_PACKAGES_DIR}/share/libcopp)
+file(COPY ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/libcopp/copyright)
+
+vcpkg_copy_pdbs()
+
+vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake)
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)

ports/libcopp/usage

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+The package libcopp provides CMake integration:
+
+    find_package(Libcopp CONFIG REQUIRED)
+    target_include_directories(main PRIVATE ${Libcopp_INCLUDE_DIRS})
+    target_link_libraries(main PRIVATE ${Libcotask_LIBRARIES} ${Libcopp_LIBRARIES})