[PATCH v1 0/5 Add support for CRC64 generation in linker

[binutils@emagii.com]

Supports the following new linker commands:
* CRC64 ECMA                     '(' crc_start ',' crc_end ')'
* CRC64 ISO                      '(' crc_start ',' crc_end ')'
* CRC64 POLY  '[' mustbe_exp ']' '(' crc_start ',' crc_end ')'
* CRC64 POLYI '[' mustbe_exp ']' '(' crc_start ',' crc_end ')'
* CRC64 TABLE

ECMA  == 0x42F0E1EBA9EA3693
ISO   == 0xD800000000000000
POLY  == Allows your own polynome
POLYI == Allows your own polynome, with inversion during calc

The CRC is calculated from crc_start to crc_end (not included)

The "CRC64 <polynome> command
* Allows specifying the polynom (ECMA(default), ISO or your own)
* Allows for inversion in the CRC calculation (CRC64-WE)
* Allows specifying the area that should be checked.
* reserves room for the CRC (8 bytes)
* Declares a symbol ___CRC64___ for the address of the CRC.
* Declares a symbol ___CRC64_START___ for the first address of the checked area
* Declares a symbol ___CRC64_END___ for the first address after the checked area

The CRC TABLE command
  This is used to speed up the CRC calculation.
* Creates a 2kB table which speeds up the CRC calculation
* Can insert the 2kB table into the .text section at current location.
* Declares a symbol ___CRC64_TABLE___ if the table is inserted.

Comments on the code:
This version also supports the
* DEBUG ON
* DEBUG OFF
turning on/off yydebug


The ld.texi stuff needs some work. Not very experienced with that.

Added enty in NEWS

Added 4 test cases for the different CRC64 polynome commands.

The code is using the libcrc released under an MIT license found in
* https://www.libcrc.org/
* https://github.com/lammertb/libcrc/tree/v2.0
Author:  Lammert Bies
A license for libcrc is added to the patch.

[PATCH v1 1/5] ldlex.l: CRC64
[PATCH v1 2/5] ldgram.y: CRC64
[PATCH v1 3/5] Calculate CRC64 over the .text area
[PATCH v1 4/5] CRC64 commands documentation
[PATCH v1 5/5] CRC64 testsuite