abseil-cpp-20181127-bp151.1.2

- Add soname to all *.so* files.

- Fix build with Bazel 0.22.0.
- Add optflags.

- Fix aarch64 and ppc64 builds

- Trim redundancies from description.

- Update to version 20181127:
  * Export of internal Abseil changes. -- 15d7bcf28220750db46930f4d8c090b54e3ae5fe by Jon Cohen <cohenjon@google.com>:
  * Export of internal Abseil changes. -- 5278e56bd7d322ecf161eaf29fd7fa3941d7431b by Greg Falcon <gfalcon@google.com>:
- Switch from CMake to Bazel

- Update to version 20181116:
  * Export of internal Abseil changes. -- da04b8cd21f6225d71397471474d34a77df0efd6 by Jon Cohen <cohenjon@google.com>:
  * Export of internal Abseil changes. -- 5f1ab09522226336830d9ea6ef7276d37f536ac5 by Abseil Team <absl-team@google.com>:
  * Export of internal Abseil changes. -- 07575526242a8e1275ac4223a3d2822795f46569 by CJ Johnson <johnsoncj@google.com>:
  * Export of internal Abseil changes. -- 178e7a9a76fc8fcd6df6335b59139cbe644a16b9 by Jon Cohen <cohenjon@google.com>:
  * Export of internal Abseil changes. -- ee19e203eca970ff88e8f25ce4e19c32e143b988 by Jon Cohen <cohenjon@google.com>:
  * Export of internal Abseil changes. -- 4e224c85c3730398919fc5195cb1fc7a752e6e4f by Mark Barolak <mbar@google.com>:
  * Export of internal Abseil changes. -- 9e8aa654630015ea8221703b0ea10dd1a47a848f by Abseil Team <absl-team@google.com>:
  * Export of internal Abseil changes. -- ba4dd47492748bd630462eb68b7959037fc6a11a by Abseil Team <absl-team@google.com>:
  * Fix compilation of generic byteswap routines
  * Fix absl::container on VS2017 v15.8 (#192)