Better handle LINK_ALL_SYMBOLS option in cmake/generic.cmake

[acmol]

We implemented two methods(cc_library, cc_binary) that accept LINK_ALL_SYMBOLS (which means export all symbols when linking, by wrapping the libs with gcc options "-Wl,--whole-archive" and "-Wl,--no-whole-archive" around) as argument in cmake/generic.cmake.

1. A binary or a library can use ALL_SYMBOLS_DEPS to tell the linker that it needs all the symbols in its deps.

2. A library who have LINK_ALL_SYMBOLS attribute should export all symbols to the ones that depend on it. We expect these symbols can be exported recursively, however only the ones that depend this library directly will link all the symbols currently.

3. cc_test don't have similar functionality.

So, cmake/generic.cmake's cc_library/cc_binary/cc_test needs improvements to handle LINK_ALL_SYMBOLS.