[argh] Add new port (#5266)

ports/argh/CONTROL

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+Source: argh
+Version: 2018-12-18
+Description: Argh! A minimalist argument handler.

ports/argh/portfile.cmake

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+# header-only library
+
+include(vcpkg_common_functions)
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO adishavit/argh
+    REF a1edee559757e076e570b8f6c2f555d8d00b373c
+    SHA512 a100c7ff20ef9ed39d53efeac5507a6ed59fb99ccba36ac4b5f8f5aaac6782f8e951b2f26b9b50f6c6fdbc53b5bceaabbb9dd9b9539f968fc1037733342e17a6
+    HEAD_REF master
+)
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    PREFER_NINJA
+    OPTIONS
+        -DBUILD_TESTS=OFF
+        -DBUILD_EXAMPLES=OFF
+)
+
+vcpkg_install_cmake()
+
+if(EXISTS ${CURRENT_PACKAGES_DIR}/CMake)
+    vcpkg_fixup_cmake_targets(CONFIG_PATH CMake)
+elseif(EXISTS ${CURRENT_PACKAGES_DIR}/lib/cmake/${PORT})
+    vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake/${PORT})
+endif()
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug ${CURRENT_PACKAGES_DIR}/lib)
+file(REMOVE ${CURRENT_PACKAGES_DIR}/README.md)
+
+# Handle copyright
+configure_file(${SOURCE_PATH}/LICENSE ${CURRENT_PACKAGES_DIR}/share/${PORT}/copyright COPYONLY)
+
+# CMake integration test
+vcpkg_test_cmake(PACKAGE_NAME ${PORT})