Improvements to CMake configuration for the binary distribution (issue #1404).
- Add LIBCEF_APPEND_PLATFORM_SOURCES macro definition in libcef_dll/CMakeLists.txt to remove dependency on macros.cmake.
- Don't add the default "lib" prefix to the libcef_dll_wrapper output library name.
- Fix a documentation error in CMakeLists.txt.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1886 5089003a-bbd8-11dd-ad1f-f1f9622dbc98