devel/binutils: Bring back ansidecl.h

A missing ansidecl.h is causing some ports build failures because of
and unknown ENUM_BITFIELD. This commit brings it back.

Previous commits which removed ansidecl.h, 8b115343ad84e and 95c499bbd7f34,
failed to say why the file was removed. We can only guess the reason, to
solve an undocumented problem at the time.

PR: 269878
Submitted by: yuri
Reported by: yuri
MFH: 2023Q1