4011 ar does weird things with extended ELF sections

@@ -68,10 +68,12 @@
 @ MSG_ELF_GETDATA_FILE  "ar: %s has bad elf format: %s\n"
 @ MSG_ELF_GETDATA_AR    "ar: %s(%s) has bad elf format: %s\n"
 @ MSG_ELF_GETSCN_FILE   "ar: %s has no section header or bad elf format: %s\n"
 @ MSG_ELF_GETSCN_AR     "ar: %s(%s) has no section header or bad elf \
                          format: %s\n"
+@ MSG_ELF_GETSHDRSTRNDX_FILE "ar: %s has no string table index: %s\n"
+@ MSG_ELF_GETSHDRSTRNDX_AR "ar: %s(%s) has no string table index: %s\n"
 @ MSG_ELF_MALARCHIVE    "ar: %s: offset %lld: malformed archive: %s\n"
 @ MSG_ELF_RAWFILE       "ar: elf_rawfile() failed: %s\n"
 @ MSG_ELF_VERSION       "ar: libelf.a out of date: %s\n"
 @ MSG_W_ELF_NODATA_FILE "ar: %s has no data in section header table\n"
 @ MSG_W_ELF_NODATA_AR   "ar: %s(%s) has no data in section header table\n"