[libc++][CMake] Do not define `cxx_shared_EXPORTS` when building the shared library
[libc++][CMake] Do not define `cxx_shared_EXPORTS` when building the shared library

CMake will define -Dcxx_shared_EXPORTS when building the shared library
by default. In theory, this is used to signal to the library that we're
building a shared library and that dllimport/dllexport should be used.
However, we already have our own way of doing that, so I'm removing this
define to avoid meaningless command line arguments in the build.

git-svn-id: 756ef344af921d95d562d9e9f9389127a89a6314@356167 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx