Log Message:
Update yasm to 0.4.0 using patches provided by FUKAUMI Naoki in PR pkg/30445.

New features since 0.2.2:
* ELF AMD64 and 32-bit shared object support (using the NASM notation
   "WRT ..got", etc).
* STABS debugging format (enable with "-g stabs").
* NASM-like list format.
* XDF object format (64-bit basic format, similar in spirit to NASM's RDF).
* Dozens of bugfixes in x86 and AMD64 support.
* Numerous cross-platform build fixes.
* No perl dependencies for standard build.
* New man pages: yasm(1) and yasm_arch(7).
*  Full support for ELF, including support for both AMD64 and 32-bit
   x86 targets; note: for AMD64 output, the machine type must be set
   to "amd64" using the "-m" command line option, e.g.
     "yasm -m amd64 -f elf test.asm".
* Full warnings for integer overflow.
* Full support for AMD64 RIP-relative addressing; the two forms supported
  are "[rip+val]" (direct index) and "[sym wrt rip]" \ 
(relocated relative).
* Many AMD64 bugfixes including correct operand size handling (and o64
  override); thanks to the many bug reports to help improve YASM in this area!