Auto-sync with upstream branch master
    
    Upstream commit: 2f39e44a8417b4186a7f15bfeac5d0b557e63e03
    
    - Account for octal marker in %#o format (rhbz#2165869)
    - Use binutils 2.40 branch in build-many-glibcs.py
    - Use MPFR 4.2.0, MPC 1.3.1 in build-many-glibcs.py
    
    - Apply glibc-dprintf-length.patch to fix dprintf return value
      regression.