[Bug target/38182] stddef.h assumes machinee/ansi.h defines _ANSI_H_

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38182

--- Comment #20 from joseph at codesourcery dot com <joseph at codesourcery dot 
com> ---
r261797 removed all references to _ANSI_H_ from stddef.h, so this issue 
can't be relevant after then.