gnome: early exit from _gir_has_option if g-ir-scanner is executable

_gir_has_option runs g-ir-scanner --help | grep <option> to determine if
the current version of g-ir-scanner supports a particular option. This
already early exists if g-ir-scanner is a OverrideProgram, as it cannot
be executed if it is (technically OverridePrograms can actually be
executed during configure time, but not g-ir-scanner; as it depends on
native modules). Do the same in case g-ir-scanner is an executable (it
currently isn't but I might want to move it into one, as to avoid the
rule-dependency issue with the aforementioned native module)

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