build, qt: Drop support for i686-linux-android host

depends/README.md

@@ -38,7 +38,6 @@ Common `host-platform-triplet`s for cross compilation are:
 - `s390x-linux-gnu` for Linux S390X
 - `armv7a-linux-android` for Android ARM 32 bit
 - `aarch64-linux-android` for Android ARM 64 bit
-- `i686-linux-android` for Android x86 32 bit
 - `x86_64-linux-android` for Android x86 64 bit
 
 The paths are automatically configured and no other options are needed unless targeting [Android](../doc/build-android.md).

depends/packages/qt.mk

@@ -182,7 +182,6 @@ $(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
 $(package)_config_opts_x86_64_android += -android-arch x86_64
-$(package)_config_opts_i686_android += -android-arch i686
 endef
 
 define $(package)_fetch_cmds