BFD overflows (part 2)

[Mike Frysinger]

the previous patch by Alan Modra fixed up many of the test cases we've been 
using, but there's still some left that cause strings to segfualt (tested 
against vanilla binutils-2.16.90.0.3)

find attached two binaries which trigger segfaults in different locations

strings.024:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000419f37 in bfd_section_from_shdr (abfd=0x584090, shindex=20)
    at elf.c:1751
1751          if (elf_elfsections (abfd)[hdr->sh_link]->sh_type != SHT_STRTAB)

strings.095:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000418678 in bfd_elf_string_from_elf_section (abfd=0x4643a0, 
    shindex=5784064, strindex=47) at elf.c:280
280     {
-mike
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