[Bug c/55383] -Wcast-qual reports incorrect message

[magnus.reftel at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55383

--- Comment #10 from Magnus Reftel <magnus.reftel at gmail dot com> ---
Applied Manuel López-Ibáñez's patch on top of trunk and tested Jeremy's
testcase. Without the patch, the error message says that
"__attribute__((noreturn))" is being cast away. With the patch, the error
message says that "volatile" is being cast away. Running "make check" to see if
there were any regressions.