Fileinfo: load additional info from PT_NOTE segment

[mbandzi]

Besides information for core dumps (#142), ELF note section contains other types of useful information.

e. g. output from readelf -n:

Displaying notes found at file offset 0x00000254 with length 0x00000020:
  Owner                 Data size	Description
  GNU                  0x00000010	NT_GNU_ABI_TAG (ABI version tag)
    OS: Linux, ABI: 2.6.32

while fileinfo -v can't tell neither:

OS/ABI            : No extensions or unspecified
OS/ABI version    : 0

There is probably much more information, that can be retrieved.

[mbandzi]

possible ELF linker detection for cpdetect from NT_GNU_GOLD_VERSION.

[mbandzi]

HP compiler (NT_HP_COMPILER) and linker (NT_HP_LINKER) detection.
Android OS/ABI from ABI_NOTETYPE.

[mbandzi]

Added in d55b541c.