e9compile fixes

[milahu]

fix #75 etc

remove the include path examples/ users should set their own include paths

e9compile foo.c -I bar/

[GJDuck]

Thanks for interest in cleaning this up. But I think some of the changes are not compatible with older versions of bash, e.g.:

    $ ./e9compile.sh print.c
    ./e9compile.sh: 65: ./e9compile.sh: Syntax error: "(" unexpected

It works fine in newer versions. Generally I'd prefer it works on even very old versions, if there is no pressing reason to use newer features.

[milahu]

true, this breaks in posix shells

$ ash e9compile.sh asdf.c
e9compile.sh: line 65: syntax error: unexpected "("

CFLAGS=(

---

$ mrsh e9compile.sh asdf.c
e9compile.sh:20:10: syntax error: invalid parameter name

    RED=$'\033[31m'

---

$ yash e9compile.sh asdf.c
e9compile.sh:54: syntax error: invalid character `@' in parameter expansion
e9compile.sh:54: syntax error: `esac' is missing

        echo "${RED}error${OFF}: file ${1@Q} must have a .c/.cpp/.s extension" >&2

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the only thing that would work is removing the -I examples/ arguments