[PATCH] Treat STV_HIDDEN and STV_INTERNAL symbols as STB_LOCAL

[Roland McGrath]

The code should have comments explaining why visibility is being checked
despite the fact that it ought to be irrelevant.  The cleanest way to do
this would be to introduce a macro for the "treat as local?" predicate and
make the cases you touched all use that.

The ELFW and ElfW macros are used with no space before the paren as a
special exception, because they are not normal function-like macros but
rather ElfW(Foo) stands in for Elf32_Foo and ELFW(ST_FOO) stands in for
ELF32_ST_FOO so making them look more like a single token fits better.