Handle GNU Build Attribute ELF Notes.

Handle GNU Build Attribute ELF Notes.

GNU Build Attribute ELF Notes are generated by the GCC annobin plugin
and described at https://fedoraproject.org/wiki/Toolchain/Watermark

Unfortunately the constants aren't yet described in the standard glibc
elf.h so they have been added to the elfutils specific elf-knowledge.h.

The notes abuse the name owner field to encode some data not in the
description. This makes it a bit hard to parse. We have to match the
note owner name prefix (to "GA") to be sure the type is valid. We also
cannot rely on the owner name being a valid C string since the attribute
name and value can contain zero (terminators). So pass around namesz
to the ebl note parsing functions.

eu-elflint will recognize and eu-readelf -n will now show the notes:

Note section [27] '.gnu.build.attributes' of 56080 bytes at offset 0x114564:
  Owner          Data size  Type
  GA                    16  GNU Build Attribute OPEN
    Address Range: 0x2f30f - 0x2f30f
    VERSION: "3p8"
  GA                     0  GNU Build Attribute OPEN
    TOOL: "gcc 8.2.1 20180801"
  GA                     0  GNU Build Attribute OPEN
    "GOW": 45
  GA                     0  GNU Build Attribute OPEN
    STACK_PROT: 0
  GA                     0  GNU Build Attribute OPEN
    "stack_clash": TRUE
  GA                     0  GNU Build Attribute OPEN
    "cf_protection": 0
  GA                     0  GNU Build Attribute OPEN
    "GLIBCXX_ASSERTIONS": TRUE
  GA                     0  GNU Build Attribute OPEN
    "FORTIFY": 0
  GA                     0  GNU Build Attribute OPEN
    PIC: 3
  GA                     0  GNU Build Attribute OPEN
    SHORT_ENUM: FALSE
  GA                     0  GNU Build Attribute OPEN
    ABI: c001100000012
  GA                     0  GNU Build Attribute OPEN
    "stack_realign": FALSE

A new test was added to run-readelf -n for the existing annobin file.

Signed-off-by: Mark Wielaard <mark@klomp.org>