[Android] Added tools (unix bash scripts) to recompile Android extlibs

For some reason, one might want to recompile the extlibs but this is a tedious task. That's why these scripts are provided.
Please read readme.txt before using them!

tools/android/create_toolchains.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+create_toolchain () {
+
+    export SYSROOT=$NDK/platforms/android-$1/arch-$2/
+
+    MAKE=$NDK/build/tools/make-standalone-toolchain.sh
+
+    PLATFORM=--platform=android-$1
+    DIR=--install-dir=toolchains/$2
+
+	# Abort if already created
+	if [ -d "$PWD/toolchains/$2" ]
+	then
+		return
+	fi
+
+    if [ "$2" = "arm" ]
+    then
+        TOOLCHAIN=--toolchain=arm-linux-androideabi-4.8
+    elif [ "$2" = "x86" ]
+    then
+        TOOLCHAIN=--toolchain=x86-4.8
+    elif [ "$2" = "mips" ]
+    then
+        TOOLCHAIN=--toolchain=mipsel-linux-android-4.8
+    else
+        echo "Abort."
+        exit 1
+    fi
+
+    $MAKE $PLATFORM $TOOLCHAIN $DIR --stl=stlport
+
+    # move linux/soundcard.h to sys/soundcard.h
+    mv $PWD/toolchains/$2/sysroot/usr/include/linux/soundcard.h $PWD/toolchains/$2/sysroot/usr/include/sys
+}
+
+create_toolchain 9 arm
+create_toolchain 9 x86
+create_toolchain 9 mips