Describe the pull request
This PR fixes and issue for protobuf when building for Android.
When linking, an error "undefined reference to '__android_log_write' was happening.

The original error is likely inside protobuf CMakeLists, which should link the log library under Android: see this issue in protobuf repo

This fixes #8218

• Which triplets are supported/not supported?
  There is no official Android triplet at the moment. I will add an example triplet below.

• Have you updated the CI baseline?
  No

• Does your PR follow the maintainer guide?
  Yes

There is no official android triplet file. So, I provide an example one below. May be it could be an inspiration for a triplet in the community folder (however I am not an android expert).

Steps to reproduce the build

1. Use this triplet file:

triplets/android-armeabi-v7a.cmake

set(VCPKG_TARGET_ARCHITECTURE arm)
set(VCPKG_CRT_LINKAGE static)
set(VCPKG_LIBRARY_LINKAGE dynamic)
set(VCPKG_CMAKE_SYSTEM_NAME Android)

set(ANDROID_NDK_HOME $ENV{ANDROID_NDK_HOME})
if ("${ANDROID_NDK_HOME}" MATCHES "^$")
  message(FATAL_ERROR 
    "Please set an env variable ANDROID_NDK_HOME pointing to your ndk-bundle folder. 
    For example: export ANDROID_NDK_HOME=/home/your-account/Android/Sdk/ndk-bundle")
endif()
set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE ${ANDROID_NDK_HOME}/build/cmake/android.toolchain.cmake)

set(ANDROID_ABI armeabi-v7a)
# ANDROID_ABI can be : "armeabi-v7a" , "armeabi-v7a with NEON", "arm64-v8a", "x86" or "x86_64"

2. Download and install the android ndk-bundle

3. Set an env var to the ndk-bundle folder

    export ANDROID_NDK_HOME=/home/your-account/Android/Sdk/ndk-bundle

4. Build the protobuf package

    ./vcpkg install "protobuf:android-armeabi-v7a"