packages:mold: add version 2.40.0

Add newly released mold version 2.40.0 from upstream
https://github.com/rui314/mold

2.40.0
New Features
- mold now lays out DWARF32 debug info before DWARF64 in output debug
  sections to mitigate relocation overflow issues with DWARF32 when a
  debug info section exceeds 4 GiB. This should help people who are
  building extremely large executables in debug mode.

  Here are the details: By default, GCC and Clang emit DWARF32 even for
  64-bit code. That is, the debug info typically uses 32 bit offsets to
  refer to locations in other debug info sections while it uses 64 bits
  to represent addresses. This imposes a limitation on the largest
  offset DWARF32 debug info can refer to, which is 4 GiB. If the output
  debug section exceeds that size, the linker may report a relocation
  overflow error. You can instruct the compilers to emit DWARF64, which
  uses 64 bits for inter-debug info references, if you are building an
  extremely large executable. So, the proper fix for the relocation
  overflow issue is to build all object files with -gdwarf64. However,
  rebuilding all static libraries with the new compiler flag is not
  always feasible for various reasons. This new feature mitigates the
  issue by placing DWARF32 at the beginning of output debug info
  sections, followed by DWARF64. By doing so, relocation overflow can be
  prevented as long as the total size of DWARF32 remains under 4 GiB,
  allowing users to continue using object files compiled without
  -gdwarf64 in very large executables.

  Note that mold only sorts debug section contents when their size
  exceeds 4 GiB. Therefore, for most outputs, this mitigation doesn't
  change the result at all.

Bug Fixes and Compatibility Improvements
- Fixed a regression introduced in 2.38.0 in which a thread-local
  variable with an unusually large alignment might not have been aligned
  properly. That caused mislinking of systemd when LTO was enabled
- Fixed a regression introduced in 2.38.0 in which --as-needed was
  ignored when creating an executable under a rare condition.
- Fixed an assertion failure on some targets that is triggered when an
  weak undefined symbol in an executable is promoted to a dynamic symbol
  with the -z dynamic-undefined-weak option.
- mold now ignores --dynamic-linker if -static is given. The new
  behavior is compatible with GNU ld.

Signed-off-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>

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