Revert "Use timeout when reading debugserver's port from a named pipe."

This reverts commit 4a5ad2c077166cc3d6e7ab4cc6e3dcbbe922af86.

Windows doesn't support select() for pipe objects, and this also fails
to compile on Windows.  Reverting this until we can get it sorted out
to keep the windows build working.

llvm-svn: 223392