vgabios: Add support for vbe get/set line length function.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
diff --git a/vgasrc/bochsvga.h b/vgasrc/bochsvga.h
index 26a82e0..b6abf0a 100644
--- a/vgasrc/bochsvga.h
+++ b/vgasrc/bochsvga.h
@@ -57,6 +57,8 @@
 struct vgamode_s *bochsvga_find_mode(int mode);
 int bochsvga_get_window(struct vgamode_s *vmode_g, int window);
 int bochsvga_set_window(struct vgamode_s *vmode_g, int window, int val);
+int bochsvga_get_linelength(struct vgamode_s *vmode_g);
+int bochsvga_set_linelength(struct vgamode_s *vmode_g, int val);
 int bochsvga_set_mode(struct vgamode_s *vmode_g, int flags);
 
 #endif // bochsvga.h