Proposed fix for FIRE-543 - Hovertext renders as overlay on top of everything else

(transplanted from 7af0278beaefa4fb1eb9a41f4e9317ac5fe37690)

indra/llrender/llfontgl.cpp

@@ -195,6 +195,8 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 	origin.mV[VX] -= llround((F32)sCurOrigin.mX) - (sCurOrigin.mX);
 	origin.mV[VY] -= llround((F32)sCurOrigin.mY) - (sCurOrigin.mY);
 
+	// don't forget to do the depth translation, too. -Zi
+	gGL.translatef(0.f,0.f,sCurOrigin.mZ);
 
 	S32 chars_drawn = 0;
 	S32 i;