Add dt needed inside dt dynamic struct

[ghost]

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• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've added tests that prove my fix is effective or that my feature works (if possible)
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Detailed description
Add the dt_needed array.
So i could remove the old dyn entries buffer.

This PR need the validation of the pr #17004

Test plan
One regression test fail. But for me the test is false.

The expected value for the test suite

-vaddr      paddr      type   name
----------------------------------
-0x00600988 0x00000988 SET_64 __gmon_start__
-0x006009a8 0x000009a8 SET_64 write
-0x006009b0 0x000009b0 SET_64 close
-0x006009b8 0x000009b8 SET_64 __libc_start_main
-0x006009c0 0x000009c0 SET_64 open

❯ readelf --relocs --use-dynamic ./test/bins/elf/analysis/dynamic-poffset

'RELA' relocation section at offset 0x0 contains 17179869188 bytes:
readelf: Warning: Virtual address 0x0 not located in any PT_LOAD segment.
readelf: Error: Reading 17179869188 bytes extends past end of file for 64-bit relocation data

The dynamic section is invalid.

Closing issues
Work on #12732

[lgtm-com]

This pull request introduces 1 alert when merging 1614af3 into d236343 - view on LGTM.com

new alerts:

• 1 for FIXME comment

[ghost]

@ret2libc Okay i just found one little problem.
the definition of Elf_Dyn is

           typedef struct {
               Elf32_Sword    d_tag;
               union {
                   Elf32_Word d_val;
                   Elf32_Addr d_ptr;
               } d_un;
           } Elf32_Dyn;
           extern Elf32_Dyn _DYNAMIC[];

           typedef struct {
               Elf64_Sxword    d_tag;
               union {
                   Elf64_Xword d_val;
                   Elf64_Addr  d_ptr;
               } d_un;
           } Elf64_Dyn;
           extern Elf64_Dyn _DYNAMIC[];

But the dyn_info only use Elf_(Xword). Or Elf_(Xword) != Elf_(Word).
Maybe in an other pr i will create a new Macro Elf_(Val).
It is why for DT_NEEDED entry i used Elf_(Off)

[ret2libc]

@ret2libc Okay i just found one little problem.
the definition of Elf_Dyn is

           typedef struct {
               Elf32_Sword    d_tag;
               union {
                   Elf32_Word d_val;
                   Elf32_Addr d_ptr;
               } d_un;
           } Elf32_Dyn;
           extern Elf32_Dyn _DYNAMIC[];

           typedef struct {
               Elf64_Sxword    d_tag;
               union {
                   Elf64_Xword d_val;
                   Elf64_Addr  d_ptr;
               } d_un;
           } Elf64_Dyn;
           extern Elf64_Dyn _DYNAMIC[];

But the dyn_info only use Elf_(Xword). Or Elf_(Xword) != Elf_(Word).
Maybe in an other pr i will create a new Macro Elf_(Val).
It is why for DT_NEEDED entry i used Elf_(Off)

If in doubt, you can as well just use ut64 and cast everything to ut64. It will work for both Elf32 and Elf64, I think.

[ret2libc]

Ok, looks better thanks! Please update the tests as well and I think this looks good ;)