In the CMake build, make sure that the DLL import library is generated.

* CMakeLists.txt: Define the export blacklist as in SConstruct.
   Generate a Windows DEF file and add it to the shared-lib sources.
* build/SerfWindowsToolkit.cmake (SerfWindowsGenDef): New function.
   Generates the DEF file, apparently just like build/gen_def.py.

git-svn-id: https://svn.apache.org/repos/asf/serf/trunk@1834948 13f79535-47bb-0310-9956-ffa450edef68
2 files changed