CMake: Windows DLLs lack version information

The cares.rc was not included in the build for CMake.  Conditionally
add it when building for Windows.

Fix By: Brad House (@bradh352)
Fixes Bug: #460

src/lib/CMakeLists.txt

@@ -3,6 +3,11 @@
 transform_makefile_inc("Makefile.inc" "${PROJECT_BINARY_DIR}/src/lib/Makefile.inc.cmake")
 include(${PROJECT_BINARY_DIR}/src/lib/Makefile.inc.cmake)
 
+# Include resource file in windows builds for versioned DLLs
+IF (WIN32)
+	LIST (APPEND CSOURCES cares.rc)
+ENDIF()
+
 # Write ares_config.h configuration file.  This is used only for the build.
 CONFIGURE_FILE (ares_config.h.cmake ${PROJECT_BINARY_DIR}/ares_config.h)