Add Android alignment tests to CI

[slouken]

• I ran check_elf_alignment.sh on the test apks and it looks good: libSDL3.so: ALIGNED
• I could add this check as part of the CI tests to prevent a regression, if you have pointers for where to add it, I'd be glad to.
• The test libs themselves are not aligned: analyzing testaudiorecording.apk gives: libtestaudiorecording.so: UNALIGNED. I took a quick stab at trying to determine where to add the fix, is it here?

--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -115,6 +115,8 @@ function(add_sdl_test_executable TARGET)
         list(APPEND EXTRA_SOURCES ${RESOURCE_FILES})
     endif()
     if(ANDROID)
+        target_link_options(${TARGET} "-Wl,-z,max-page-size=16384")
+        target_link_options(${TARGET} "-Wl,-z,common-page-size=16384")
         add_library(${TARGET} SHARED ${AST_SOURCES} ${EXTRA_SOURCES})
     else()
         add_executable(${TARGET} ${AST_SOURCES} ${EXTRA_SOURCES})

Originally posted by @elevenfive in #13470 (comment)

[madebr]

* I could add this check as part of the CI tests to prevent a regression, if you have pointers for where to add it, I'd be glad to.

You can add a new step here to generic.yml that looks as following.
It will test the binaries built by CMake

- name: 'Verify Android alignment'
  if: ${{ matrix.platform.android-ndk && !matrix.platform.no-cmake }}
  run: |
    # Check build/libSDL3.so
    # Check test binaries: e.g. build/test/libtestsprite.so

We currently build the Android binaries with NDK 21e.

* The test libs themselves are not aligned: analyzing `testaudiorecording.apk` gives: `libtestaudiorecording.so: UNALIGNED`.  I took a quick stab at trying to determine where to add the fix, is it here?

That looks correct!
(Don't forget the PRIVATE.)