[pistache] Add new port (#7547)

* [pistache] Add new port

* Update prompt messages

* Remove pkgconfig file from lib and debug/lib.

ports/pistache/CONTROL

@@ -0,0 +1,4 @@
+Source: pistache
+Version: 2019-08-05
+Homepage: https://github.com/oktal/pistache
+Description: Pistache is a modern and elegant HTTP and REST framework for C++. It is entirely written in pure-C++11 and provides a clear and pleasant API.

ports/pistache/portfile.cmake

@@ -0,0 +1,31 @@
+include(vcpkg_common_functions)
+
+if(NOT VCPKG_CMAKE_SYSTEM_NAME STREQUAL "Linux")
+    message(FATAL_ERROR "${PORT} currently only supports Linux platform.")
+endif()
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO oktal/pistache
+    REF 4dc9e3ef9a1b953a62e5fadbed88e72b4b3734de
+    SHA512 427b6a6e7200e5f91ce8737cd1cc5d6cd689025033c85979c96f0ece64ae05d9c6839a936d7d6015b0e1065dc72362f6f70ab588ea7cae7aa718dfe5cd288554
+    HEAD_REF master
+)
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    PREFER_NINJA 
+)
+
+vcpkg_install_cmake()
+
+vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake/${PORT})
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/share)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/lib/pkgconfig)
+
+# Handle copyright
+file(COPY ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/${PORT})
+file(RENAME ${CURRENT_PACKAGES_DIR}/share/${PORT}/LICENSE ${CURRENT_PACKAGES_DIR}/share/${PORT}/copyright)