Bazel doesn't allow one to give different flags for C and C++ files, so
trying to set -std=c11 for all ssl/ sources (which now include C++)
blows up.

This change splits the lists for Bazel so that they can be put in
different cc_library targets and thus have different flags.

Change-Id: I1e3dee01b6558de59246bc470527d44c9c86b188
Reviewed-on: https://boringssl-review.googlesource.com/13206
Reviewed-by: Adam Langley <agl@google.com>

Unlike the Scoped* types, bssl::UniquePtr is available to C++ users, and
offered for a large variety of types.  The 'extern "C++"' trick is used
to make the C++ bits digestible to C callers that wrap header files in
'extern "C"'.

Change-Id: Ifbca4c2997d6628e33028c7d7620c72aff0f862e
Reviewed-on: https://boringssl-review.googlesource.com/10521
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

Bazel sees BUILD files are markers for different packages. So by having
a file named “BUILD” in the source tree, Bazel thinks that there are
several packages involved.

This change renames it to BUILD.toplevel to avoid this.

Change-Id: Ia76167334cd52f72ff25ecb08533c30e5e423ab8

This reverts commits:
8d79ed6740
19fdcb5234
8d79ed6740

Because WebRTC (at least) includes our headers in an extern "C" block,
which precludes having any C++ in them.

Change-Id: Ia849f43795a40034cbd45b22ea680b51aab28b2d

This change scatters the contents of the two scoped_types.h files into
the headers for each of the areas of the code. The types are now in the
|bssl| namespace.

Change-Id: I802b8de68fba4786b6a0ac1bacd11d81d5842423
Reviewed-on: https://boringssl-review.googlesource.com/8731
Reviewed-by: Adam Langley <agl@google.com>

Since Bazel doesn't have a shared vs static concept that's exposed to
the build rules (as far as I know) symbol visibility would mean that the
symbols might be exposed when building a larger library. That could be
fixed with a linker script, but this change appears to be slightly more
useful for our consumers.

(Also, if we're going to set -fvisibility=hidden, we should also have set
the defines needed to include the visibility annotations.)

Change-Id: Ic7d64a553da48cfb9cf5460d26254de7e105fd65
Reviewed-on: https://boringssl-review.googlesource.com/8664
Reviewed-by: Adam Langley <agl@google.com>

When we have *-with-bazel branches this BUILD file will be copied to the
top-level for consumers that want to use Bazel.

From empirical testing, x86-64 on Linux is spelt “k8” and x86-64 on
macOS is spelt “darwin”. I've not tried to enable assembly for any other
cases yet.

Change-Id: Ic6cb739565f145db20756fb57c0d087227fd9e18
Reviewed-on: https://boringssl-review.googlesource.com/8571
Reviewed-by: Adam Langley <agl@google.com>