libaom v3.1.3 Released

[Wan-Teh Chang]

Hello everyone,

libaom v3.1.3 has been released. The source code of the release can be
checked out from the git repository[1] using the release tag v3.1.3.
Alternatively, the release tarball[2], along with the signature file[3],
can be downloaded.

Thanks.

[1] https://aomedia.googlesource.com/aom
[2] https://storage.googleapis.com/aom-releases/libaom-3.1.3.tar.gz
[3] https://storage.googleapis.com/aom-releases/libaom-3.1.3.tar.gz.asc

This release includes several bug fixes.

- Bug fixes:
The following four cmake changes should help the people building
libaom using MSVC.
1. exports: use CMAKE_SHARED_LIBRARY_PREFIX to determine lib name
https://aomedia-review.googlesource.com/c/aom/+/142342
2. aom_install: Install lib dlls to bindir
https://aomedia-review.googlesource.com/c/aom/+/146546
3. aom_install: use relpath for install
https://aomedia-review.googlesource.com/c/aom/+/146550
4. aom_install: don't exclude msvc from install
https://aomedia-review.googlesource.com/c/aom/+/146547

aom/aom_encoder.h: remove configure option reference
https://aomedia-review.googlesource.com/c/aom/+/146743

Issue 3113: Tests for detecting chroma subsampling in
av1_copy_and_extend_frame() do not work when y_width or y_height is 1

Issue 3115: image2yuvconfig() should calculate uv_crop_width and
uv_crop_height from y_crop_width and y_crop_height

Issue 3140: rc_overshoot_pct is documented as having a range of
0-1000, but is range checked against 0-100

Issue 3147: Build failure on Apple M1 arm64