Changelog r14

Changelog

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For Android Studio issues, follow the docs on the Android Studio site.

The platform headers have been synchronized with the Android platform. This means that the headers are now up to date, accurate, and header only bug fixes will affect all API levels. Prior to this, the M and N headers were actually the L headers, all the headers did not actually match the platform level they were supposedly for (declared functions that didn't exist, didn't declare ones that did), and many of the old API levels had missing or incorrect constants that were in newer API levels.

Since these are in some cases radically different from those we've previously shipped, these are not enabled by default. See Unified Headers for details on using the updated headers.

Note: The legacy headers will be removed in a future release. It is likely that r15 will default to using these while still being optional. If all goes well, the legacy headers will be removed in r16, so please test them now.
GCC is no longer supported. It will not be removed from the NDK just yet, but is no longer receiving backports. It cannot be removed until after libc++ has become stable enough to be the default, as some parts of gnustl are still incompatible with Clang. It will likely be removed after that point.

Fixed issue of XSI strerror_r not being available until android-23 with unified headers: https://github.com/android-ndk/ndk/issues/324.
Fixed issue of __ANDROID_API__ not being set for standalone toolchains with unified headers on Windows: https://github.com/android-ndk/ndk/issues/321.
Fixed issue of not being able to find gnustl headers with standalone toolchains for mips32: https://github.com/android-ndk/ndk/issues/310.
Removed accidentally exposed non-NDK API Vulkan headers. The functions in the non-API headers themselves weren't exposed, so these weren't usable anyways.

_BSD_SOURCE will never be defined by the NDK when using unified headers; the user's setting will be obeyed. When using the deprecated headers, whether or not this was defined depended on which headers you included. To continue using _BSD_SOURCE, #define it in your source files or pass it on the command line as you would for typical Linux code.

Module builds will now fail if they have any missing dependencies. To revert to the old behavior, set APP_ALLOW_MISSING_DEPS=true. See https://github.com/android-ndk/ndk/issues/208.

RTTI and exceptions are now on by default. This was done for improved compatibility with existing CMake projects. See https://github.com/android-ndk/ndk/issues/212.

libc++abi has been updated and now has a fallback implementation of __cxa_thread_atexit_impl. Non-global thread_local variables with non-trivial destructors are now supported.

The x86 ASAN issues noted since r11 appear to have been emulator specific. Up to date emulators no longer have this issue.
LTO with Clang now builds without errors on Linux and Darwin. This fixes https://github.com/android-ndk/ndk/issues/108.

The RenderScript tools are now included in the NDK once again. This fixes https://github.com/android-ndk/ndk/issues/7.

These issues will not be fixed. They affect only GCC, which is deprecated.

Standlone toolchains using libc++ and GCC do not work. This seems to be a bug in GCC. See the following commit message for more details: https://android-review.googlesource.com/#/c/247498
Standalone toolchains using GCC do not work out of the box with unified headers. They can be made to work by passing -D__ANDROID_API__=21 (replacing 21 with the same API level you passed to make_standalone_toolchain.py) when compiling.