GCC toolchain: Add {SYSROOT} substitution with support for whitespaces

Any instance of {SYROOT} string in config's CFLAGS and LDFLAGS is replaced by sysroot path obtained from "gcc -print-sysroot"

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#!/bin/bash

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set -e

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./clean_docker_container.sh || true

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./clean_docker_image.sh || true

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./build_docker_image.sh

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./create_docker_container.sh $1

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