CMake: Provide c-ares version in package export file (#296)

The CMake package export file should provide version information.

Fix By: Kyle Edwards (@KyleFromKitware)

CMakeLists.txt

@@ -665,8 +665,9 @@ IF (CARES_INSTALL)
 		PATH_VARS CMAKE_INSTALL_INCLUDEDIR
 		NO_CHECK_REQUIRED_COMPONENTS_MACRO
 	)
+	WRITE_BASIC_PACKAGE_VERSION_FILE(${PROJECT_NAME}-config-version.cmake VERSION "${CARES_VERSION}" COMPATIBILITY SameMajorVersion)
 	INSTALL (EXPORT ${PROJECT_NAME}-targets DESTINATION ${CMAKECONFIG_INSTALL_DIR} NAMESPACE ${PROJECT_NAME}::)
-	INSTALL (FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake" DESTINATION ${CMAKECONFIG_INSTALL_DIR})
+	INSTALL (FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake" "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config-version.cmake" DESTINATION ${CMAKECONFIG_INSTALL_DIR})
 
 	# pkgconfig support
 	IF (NOT CARES_SHARED)

c-ares-config.cmake.in

@@ -2,6 +2,7 @@
 
 set_and_check(c-ares_INCLUDE_DIR "@PACKAGE_CMAKE_INSTALL_INCLUDEDIR@")
 
+include("${CMAKE_CURRENT_LIST_DIR}/c-ares-config-version.cmake")
 include("${CMAKE_CURRENT_LIST_DIR}/c-ares-targets.cmake")
 
 set(c-ares_LIBRARY c-ares::cares)