Changes

Summary

1. RISC OS: use modern fallthrough mechanism (details)

Commit 4148b16ed43220b3a2b28a1516be5506592f42f5 by John-Mark Bell RISC OS: use modern fallthrough mechanism
	frontends/riscos/textarea.c (diff)
	frontends/riscos/configure/con_image.c (diff)
	frontends/riscos/save.c (diff)