[BUG?]: symbol visibility for different api levels.

### Description

`AConfiguration_setScreenRound` does not appear in `nm -D toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/aarch64-linux-android/28/libandroid.so` but not marked with `__INTRODUCED_IN`.

`ANativeWindow_getBuffersDataSpace`, `ANativeWindow_setBuffersDataSpace` and `ANativeWindow_setBuffersTransform` have opposite problem. They appear with `__INTRODUCED_IN(28)` in header but do not appear in `nm -D .../28/libandroid.so`.

Not sure if it is a bug or a documentation problem but probably it should be fixed.

### I am using a supported NDK

- [x] I have checked and the NDK I'm using is currently supported

### Affected versions

r27

Start by comparing the __INTRODUCED_IN annotations for the four named symbols with their exports in toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/lib/aarch64-linux-android/28/libandroid.so using nm -D. Determine whether the API 28 headers and library exports should agree, then verify that the selected resolution covers all four discrepancies.

Written by the indexing model from the issue text.