tools/nolibc: add 64-bit parisc support

Extend the existing parisc support to also handle 64-bit mode.

Some peculiarities:
* The nonstandard ftruncate64 system call requires a workaround.
* The linker defaults to main() as entry point, which needs to be
  switched to _start() explicitly.
* The linker defaults to dynamic linking, which needs to be disabled
  explicitly.
* With the default -Os, gcc does not use 64-bit multiplication
  instructions, requiring libgcc. Use -O2 instead.
* There is no qemu-user available.
* CONFIG_COMPAT needs to be disabled to avoid build errors due to a
  missing 32-bit vDSO compiler.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20260914-nolibc-parisc64-v3-1-f14b320117c1@weissschuh.net

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