Merge bitcoin/bitcoin#30049: build, test, doc: Temporarily remove Android-related stuff

5deb0b024e build, test, doc: Temporarily remove Android-related stuff (Hennadii Stepanov)

Pull request description:

  Previously, our Android builds were geared towards generating APKs, which relied on Qt. However, after migrating to C++20, compiling for Android became unfeasible due to Qt 5.15's compatibility limitations with NDK only up to r25, which includes an outdated embedded libc++ (see https://github.com/bitcoin/bitcoin/issues/29360).

  All removed stuff will be reinstated after migrating the build system to CMake and upgrading Qt to version 6.x.

  This PR makes possible a clean migration to the CMake-based build system as it removes code, which is not used at this moment.

ACKs for top commit:
  vasild:
    ACK 5deb0b024e
  fanquake:
    ACK 5deb0b024e - given none of this is currently tested/wont compile. Can be revisted in future.

Tree-SHA512: 3bc2ccfe881e11cc1d78c27acd6f1d86cfba86821ef3bb5eca2e80d978fdfa13659ec82284dcaadc507e2394524dea91d4b8f81d0030c1cef9708df8be76bf07

depends/packages/qt.mk

@@ -12,7 +12,6 @@ $(package)_patches += qttools_src.pro
 $(package)_patches += mac-qmake.conf
 $(package)_patches += fix_qt_pkgconfig.patch
 $(package)_patches += no-xlib.patch
-$(package)_patches += fix_android_jni_static.patch
 $(package)_patches += dont_hardcode_pwd.patch
 $(package)_patches += qtbase-moc-ignore-gcc-macro.patch
 $(package)_patches += no_warnings_for_symbols.patch
@@ -186,24 +185,6 @@ $(package)_config_opts_mingw32 += -pch
 ifneq ($(LTO),)
 $(package)_config_opts_mingw32 += -ltcg
 endif
-
-$(package)_config_opts_android = -xplatform android-clang
-$(package)_config_opts_android += -android-sdk $(ANDROID_SDK)
-$(package)_config_opts_android += -android-ndk $(ANDROID_NDK)
-$(package)_config_opts_android += -android-ndk-platform android-$(ANDROID_API_LEVEL)
-$(package)_config_opts_android += -egl
-$(package)_config_opts_android += -no-dbus
-$(package)_config_opts_android += -opengl es2
-$(package)_config_opts_android += -qt-freetype
-$(package)_config_opts_android += -no-fontconfig
-$(package)_config_opts_android += -L $(host_prefix)/lib
-$(package)_config_opts_android += -I $(host_prefix)/include
-$(package)_config_opts_android += -pch
-$(package)_config_opts_android += -no-feature-vulkan
-
-$(package)_config_opts_aarch64_android += -android-arch arm64-v8a
-$(package)_config_opts_armv7a_android += -android-arch armeabi-v7a
-$(package)_config_opts_x86_64_android += -android-arch x86_64
 endef
 
 define $(package)_fetch_cmds
@@ -244,7 +225,6 @@ define $(package)_preprocess_cmds
   patch -p1 -i $($(package)_patch_dir)/fix-macos-linker.patch && \
   patch -p1 -i $($(package)_patch_dir)/dont_hardcode_pwd.patch && \
   patch -p1 -i $($(package)_patch_dir)/fix_qt_pkgconfig.patch && \
-  patch -p1 -i $($(package)_patch_dir)/fix_android_jni_static.patch && \
   patch -p1 -i $($(package)_patch_dir)/no-xlib.patch && \
   patch -p1 -i $($(package)_patch_dir)/qtbase-moc-ignore-gcc-macro.patch && \
   patch -p1 -i $($(package)_patch_dir)/memory_resource.patch && \