devel/valgrind: add missing field to stat64 struct and fix debug logging

• Add missing st_birthtim field to vki_stat64 struct [2]
• Fix debug logging (valgrind -v -v -v -d -d -d), based on upstream commits:
  • https://sourceware.org/git/?p=valgrind.git;a=commit;h=6b92194ac
  • https://sourceware.org/git/?p=valgrind.git;a=commit;h=f06f0f718
• Bump PORTREVISION

PR: 234759 [1]
Submitted by: novel [1]
Submitted by: markj [2]
Approved by: maintainer timeout