libgloss: i386: cygmon-gmon.c: fix _mcount() return type

Author: vincent-mailhol

libgloss/i386/cygmon-gmon.c

@@ -118,7 +118,7 @@ moncontrol(int mode)
     }
 }
 
-int
+void
 monstartup(lowpc, highpc)
      char	*lowpc;
      char	*highpc;