[frontend, android] Move update_checker to frontend_common and add Android support

docs/Deps.md

@@ -62,7 +62,7 @@ Certain other dependencies will be fetched by CPM regardless. System packages *c
 * [libusb](https://github.com/libusb/libusb)
 * [VulkanMemoryAllocator](https://github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator)
 * [sirit](https://github.com/eden-emulator/sirit)
-* [httplib](https://github.com/yhirose/cpp-httplib) - if `ENABLE_QT_UPDATE_CHECKER` or `ENABLE_WEB_SERVICE` are on
+* [httplib](https://github.com/yhirose/cpp-httplib) - if `ENABLE_UPDATE_CHECKER` or `ENABLE_WEB_SERVICE` are on
   - This package is known to be broken on the AUR.
 * [cpp-jwt](https://github.com/arun11299/cpp-jwt) 1.4+ - if `ENABLE_WEB_SERVICE` is on
 * [unordered-dense](https://github.com/martinus/unordered_dense)

docs/Options.md

@@ -38,6 +38,7 @@ Notes:
 - `YUZU_USE_BUNDLED_OPENSSL` (ON for MSVC) Download bundled OpenSSL build
   * Always on for Android
   * Unavailable on OpenBSD
+- `ENABLE_UPDATE_CHECKER` (OFF) Enable update checker for the Qt an Android frontends
 
 The following options are desktop only:
 - `ENABLE_SDL2` (ON) Enable the SDL2 desktop, audio, and input frontend (HIGHLY RECOMMENDED!)
@@ -51,7 +52,6 @@ The following options are desktop only:
   * Unavailable on Windows/ARM64 and Android
 - `ENABLE_QT` (ON) Enable the Qt frontend (recommended)
 - `ENABLE_QT_TRANSLATION` (OFF) Enable translations for the Qt frontend
-- `ENABLE_QT_UPDATE_CHECKER` (OFF) Enable update checker for the Qt frontend
 - `YUZU_USE_BUNDLED_QT` (ON for MSVC) Download bundled Qt binaries
   * Note that using **system Qt** requires you to include the Qt CMake directory in `CMAKE_PREFIX_PATH`, e.g:
     * `-DCMAKE_PREFIX_PATH=C:/Qt/6.9.0/msvc2022_64/lib/cmake/Qt6`