Log Message:
Update to 5.2.1. Provided by Stefan Krüger in PR 28740.

5.2 - merged in changes for 5.01 - 5.0.4
    - added support for using encoding parameters and key derivation parameters
      with public key encryption (implemented by OAEP and DL/ECIES)
    - added Camellia, SHACAL-2, Two-Track-MAC, Whirlpool, RIPEMD-320,
      RIPEMD-128, RIPEMD-256, Base-32 coding
    - added ThreadUserTimer for timing thread CPU usage
    - added option for password-based key derivation functions
      to iterate until a mimimum elapsed thread CPU time is reached
    - added option (on by default) for DEFLATE compression to detect
      uncompressible files and process them more quickly
    - improved compatibility and performance on 64-bit platforms,
      including Alpha, IA-64, x86-64, PPC64, Sparc64, and MIPS64
    - fixed ONE_AND_ZEROS_PADDING to use 0x80 instead 0x01 as padding.
    - fixed encoding/decoding of PKCS #8 privateKeyInfo to properly
      handle optional attributes

5.2.1 - fixed bug in the "dlltest" DLL testing program
      - fixed compiling with STLport using VC .NET
      - fixed compiling with -fPIC using GCC
      - fixed compiling with -msse2 on systems without memalign()
      - fixed inability to instantiate PanamaMAC
      - fixed problems with inline documentation