Add conditionals for Protobuf 22+ API changes

[cho-m]

May need to check on some of these like if Abseil's once is equivalent.

Still needs build script fixes/workarounds to actually compile (workarounds specifically for C++17 removed functions assuming Abseil was built with that standard).

On macOS, I was able to build substituting s/-std=gnu++11/-std=gnu++17/g in configure.ac and restoring some removed functions in LLVM libc++:

CXXFLAGS=-D_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR \
  -D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION \
  -D_LIBCPP_ENABLE_CXX17_REMOVED_BINDERS

---

============================================================================
Testsuite summary for OLA 0.10.9
============================================================================
# TOTAL: 83
# PASS:  83
# SKIP:  0
# XFAIL: 0
# FAIL:  0
# XPASS: 0
# ERROR: 0
============================================================================