egl-configs: add i686 support

support/android/egl-configs/.cargo/config

@@ -1,6 +1,10 @@
 [build]
-target = "armv7-linux-androideabi"
+target = "i686-linux-android"
 
 [target.armv7-linux-androideabi]
 linker = "./ld.sh"
 runner = "./run.sh"
+
+[target.i686-linux-android]
+linker = "./ld-i686.sh"
+runner = "./run.sh"

support/android/egl-configs/ld-i686.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+NDK=../../../android-toolchains/android-ndk-r12b-linux-x86_64/android-ndk-r12b
+BIN="${NDK}/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/"
+
+"${BIN}/i686-linux-android-gcc" \
+  --sysroot "${NDK}/platforms/android-18/arch-x86" \
+  "${@}"