Partial revert of "CMake: Remove cmake module"

This reverts commit 63188667bbe81eab1fed20df03965bd8ceb16612.

CPackOptions.cmake.in

@@ -21,9 +21,11 @@ set( CSYNC_BINARY_DIR  @CSYNC_BINARY_DIR@ )
 set( MINGW_ROOT @CMAKE_FIND_ROOT_PATH@ )
 if(CSYNC_BINARY_DIR)
     set( CSYNC_LIBRARY_DIR "${CSYNC_BINARY_DIR}/src" )
+    set( CSYNC_PLUGIN_DIR  "${CSYNC_BINARY_DIR}/modules" )
     set( CSYNC_CONFIG_DIR  "${CSYNC_BINARY_DIR}/config" )
 else()
     set( CSYNC_LIBRARY_DIR "${MINGW_ROOT}/bin" )
+    set( CSYNC_PLUGIN_DIR  "${MINGW_ROOT}/plugins-0" ) #FIXME: whatever it is
     set( CSYNC_CONFIG_DIR  "${MINGW_ROOT}/etc/ocsync" )
 endif()
 set( BUILD_OWNCLOUD_OSX_BUNDLE @BUILD_OWNCLOUD_OSX_BUNDLE@)