[Android] Link native shared libraries with 16k page alignment

Fixes: #103360
Context: https://developer.android.com/guide/practices/page-sizes
Context: https://github.com/android/ndk/wiki/Changelog-r27#announcements

Sometime next year Google will start requiring that all the `.so`
libraries included in applications submitted to the Play Store to be
aligned to 16k page boundary (as opposed to the current one of 4k).

Make changes to cmake scripts used to build both the BCL native
libraries and the MonoVM so that the resulting shared libraries have the
correct alignment.

src/mono/CMakeLists.txt

@@ -506,6 +506,16 @@ else()
   message(FATAL_ERROR "TARGET_ARCH='${TARGET_ARCH}' not supported.")
 endif()
 
+if(TARGET_ANDROID AND (TARGET_AMD64 OR TARGET_ARM64))
+  # Google requires all the native libraries to be aligned to 16 bytes (for 16k memory page size)
+  # This applies only to 64-bit binaries
+  message("Android: TARGET_ARCH == ${TARGET_ARCH}")
+  if((TARGET_ARCH STREQUAL "arm64") OR (TARGET_ARCH STREQUAL "x86_64"))
+    message("Android: adding 16k alignment options")
+    add_link_options(LINKER:-z,max-page-size=16384)
+  endif()
+endif()
+
 # arm64 MacCatalyst runtime host or AOT target is more like Apple mobile targets than x64
 if ((HOST_MACCAT AND HOST_ARM64) OR (TARGET_MACCAT AND TARGET_ARM64))
   set(TARGET_APPLE_MOBILE 1)

src/native/libs/CMakeLists.txt

@@ -58,6 +58,12 @@ if (CLR_CMAKE_TARGET_UNIX OR CLR_CMAKE_TARGET_BROWSER OR CLR_CMAKE_TARGET_WASI)
         if (CROSS_ROOTFS)
             include_directories(SYSTEM "${CROSS_ROOTFS}/usr/include")
         endif ()
+
+        # Google requires all the native libraries to be aligned to 16 bytes (for 16k memory page size)
+        # This applies only to 64-bit binaries
+        if(CLR_CMAKE_TARGET_ARCH_ARM64 OR CLR_CMAKE_TARGET_ARCH_AMD64)
+            add_link_options(-Wl,-z,max-page-size=16384)
+        endif()
     endif ()
 
     string(TOUPPER ${CMAKE_BUILD_TYPE} UPPERCASE_CMAKE_BUILD_TYPE)