BFD: Fix function prototype breakage through stabs.c

BFD: Fix function prototype breakage through stabs.c

Update function prototype templates through stabs.c according to commit
eb92a17c47ea ("bfd: move sec_info from ELF to general section struct"),
which changed the generated prototypes in libbfd.h by hand rather than
by remaking them properly from sources, and causing the build to fail as
soon as libbfd.h has been regenerated.

While at it remove an extraneous character introduced by the same commit
to a comment for a new member of `struct bfd_section'.