Make build_docker.sh portable again (#308)
Last commit made the script break on macOS.
From `man sed` (On Linux):
```
       -E, -r, --regexp-extended
              use extended regular expressions in the script (for portability use POSIX -E).
```
			
			
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			@ -63,7 +63,7 @@ if [ "${CONTAINER_EXISTS}" != "" ] && [ "${CONTINUE}" != "1" ]; then
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fi
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# Modify original build-options to allow config file to be mounted in the docker container
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BUILD_OPTS="$(echo ${BUILD_OPTS:-} | sed -r 's@\-c\s?([^ ]+)@-c /config@')"
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BUILD_OPTS="$(echo ${BUILD_OPTS:-} | sed -E 's@\-c\s?([^ ]+)@-c /config@')"
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${DOCKER} build -t pi-gen "${DIR}"
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if [ "${CONTAINER_EXISTS}" != "" ]; then
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