engraving in inaccessible locations

Also from the newsgroup (2nd from "Three bugfixes for Xorns" [I got
the subject wrong on the previous spell of protection patch]):  when
phazing through walls or rock you could engrave as if it was ordinary
floor.  Again I didn't use the user's patch; it left closed doors, raised
drawbridge, and iron bars as locations where engraving was still feasible
and said "you can't write in solid rock" even if you were inside a tree.
[The 3rd of "3 xorn fixes" was for misleading feedback when attempting to
engrave while underwater; we've already fixed that one.]

     There was a suggestion that you should be able to engrave within solid
rock if you use a wand of digging, and that seems like a pretty good idea,
but the check for location comes before the check for writing instrument so
would be tricky to implement.

doc/fixes34.4

@@ -286,6 +286,7 @@ suppress "you rise from the dead" if game ends due to be turned into slime
 don't give erroneous "<mon> disppears" message for hero poly'd into quantum
 	mechanic who hits engulfer while swallowed and blinded
 feedback from casting spell of protection was wrong in some situations
+can't engrave on floor while inside solid rock, wall, or closed door
 
 
 Platform- and/or Interface-Specific Fixes