Apply LTS transformations for 20210324 LTS branch (abseil#920)

* Apply LTS transformations for 20210324 LTS branch

* Change the SOVERSION to make MacOS happy

MacOS expects the first part of the SOVERSION to fit into 16 bits.

Apply LTS transformations for 20210324 LTS branch (abseil#920)

* Apply LTS transformations for 20210324 LTS branch

* Change the SOVERSION to make MacOS happy

MacOS expects the first part of the SOVERSION to fit into 16 bits.

Cherry-picks for LTS 2020_09_23 Patch Release 3 (abseil#888)

* Adds missing <limits> include to fix GCC 11 (prerelease) build

Cherry-picks for LTS 2020_09_23 Patch Release 2

* Fixes preprocessor condition for symbols __tsan_mutex_read_lock and
__tsan_mutex_try_lock
* Fixes race in AddressIsReadable file descriptors using stronger memory ordering
* Fixes CMake dependency issues and adds `-Wl,--no-undefined` to avoid
these issues in the future.

Adds bounds-checking to the second range of absl container algorithms (…

…abseil#810)

The APIs for the two-range `absl::c_mismatch`, `absl::c_swap_ranges`,
and `absl::c_transform` are misleading as they do not check the bounds
of the second range against the first one.

This commit cleans up ensures that buggy calls are not exploitable;
non-buggy calls are unaffected.

This is consistent with both C++14's two-range `std::` equivalents and
C++20's `std::ranges::` equivalents.
http://wg21.link/mismatch
http://wg21.link/alg.swap
http://wg21.link/alg.transform

Adds bounds-checking to the second range of absl container algorithms (…

…abseil#811)

The APIs for the two-range `absl::c_mismatch`, `absl::c_swap_ranges`,
and `absl::c_transform` are misleading as they do not check the bounds
of the second range against the first one.

This commit cleans up ensures that buggy calls are not exploitable;
non-buggy calls are unaffected.

This is consistent with both C++14's two-range `std::` equivalents and
C++20's `std::ranges::` equivalents.
http://wg21.link/mismatch
http://wg21.link/alg.swap
http://wg21.link/alg.transform

Adds bounds-checking to the second range of absl container algorithms (…

…abseil#812)

The APIs for the two-range `absl::c_mismatch`, `absl::c_swap_ranges`,
and `absl::c_transform` are misleading as they do not check the bounds
of the second range against the first one.

This commit cleans up ensures that buggy calls are not exploitable;
non-buggy calls are unaffected.

This is consistent with both C++14's two-range `std::` equivalents and
C++20's `std::ranges::` equivalents.
http://wg21.link/mismatch
http://wg21.link/alg.swap
http://wg21.link/alg.transform

Adds bounds-checking to the second range of absl container algorithms (…

…abseil#813)

The APIs for the two-range `absl::c_mismatch`, `absl::c_swap_ranges`,
and `absl::c_transform` are misleading as they do not check the bounds
of the second range against the first one.

This commit cleans up ensures that buggy calls are not exploitable;
non-buggy calls are unaffected.

This is consistent with both C++14's two-range `std::` equivalents and
C++20's `std::ranges::` equivalents.
http://wg21.link/mismatch
http://wg21.link/alg.swap
http://wg21.link/alg.transform

Add 20200923 tag

Fix undefined symbol in MacOS dylib by adding absl::string dependency…

… to absl::cord as proposed by moubctez on issue abseil#624 (abseil#670)