end of score introducing wrong penalties

[eroux]

With the TeX file from #1139 and the following gabc file:

name: Urbs fortitudinis;
%%
(c3) a(i)pe(i)rí(j)te(ihz) por(i>)tas,(g_f_3!gwh) (,) qui(h)a(hhog) no(f)bís(g_h)cum(f) De(fe)us,(d) al(ef)le(f)lú(e.)ia.(e.) (::) <eu>E(i) u(i) o(j) u(i) a(ih!/gggggggggggggggggggggg) e(iio>) </eu>(::)

the last note is alone on a line. It should be completely impossible. The problem is that the .gtex contains \GreLastOfScore at the beginning of the last syllable, so in the \gre@endofglyphcommon introduces a \gre@space@count@finalpenalty which allows a break.