sqleet v0.29.0

sqleet as a drop-in replacement for the SQLite3 amalgamation.

What's new in v0.29.0?

• SQLite v3.29.0
• URI based run-time configuration (see documentation)
• chacha20() poly1305() hardening and optimizations
• Build changes
  • Define _GNU_SOURCE for syscall(2)
    • Fixes implicit declaration of syscall
  • Include stddef.h to define size_t in crypto.c
    • crypto.c can now be compiled independently
  • Fix Windows MSYS2 build
• Bug fixes
  • Fix invalid free on sqlite3RekeyVacuum()
  • Fix uninitialized codec->pagesize(#26)
• Add sqlite3ext.h to repo and release packages