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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echo "Building docker image"

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cp -f ../../../requirements.txt requirements.txt

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docker build \

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    --build-arg UID=$(id -u) \

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    --build-arg GID=$(id -g) \

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    -t beremiz_sikuli .

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