Merge bitcoin/bitcoin#22320: build: set minimum required Boost to 1.64.0

957f3584277d33b44b9f1618142f743e4083eb5d build: remove check for Boost Process header (fanquake)
df2c93321765c7f77935fd92d31722d7b65a53db build: remove workaround for Boost and std::atomic (fanquake)
2bf211696b8cd355856995ba821c74e67385b77d build: set minimum required Boost to 1.64.0 (fanquake)

Pull request description:

  Setting a newer minimum required Boost means we can remove the awkward header / compile check for Boost Process.

  If we don't do this, we should at-least make Boost Process being missing no longer a failure, otherwise anyone building using Boost < 1.64.0 would have to pass `--disable-external-signer` as well.

  The only system I can see that is affected here, (doesn't have new enough system packages) is Debian Oldstable. However, anyone compiling there, can use depends. They can also no-longer use the system GCC (6.0), and I'd assume would be using Clang 7, which would be the newest compiler available to them. It's extended, LTS support also end in 1 year from now, so anyone still using it should be considering upgrading.

  Debian Buster (Stable) has 1.67+, Ubuntu Bionic has 1.65+, any of the BSDs, recent Fedora, macOS etc all also have well and truly new enough Boost versions available.

  I think this is something we should just do for 22.0. If not, definitely for 23.0.

  Fixes #22319. Compiling Bitcoin Core should work, as `windows.h` will be included.
  Alternative to #22294.
  Would also close #22269.
  #19128 could be re-opened.

ACKs for top commit:
  laanwj:
    Tested ACK 957f3584277d33b44b9f1618142f743e4083eb5d that this fixes #22269.
  MarcoFalke:
    review ACK 957f3584277d33b44b9f1618142f743e4083eb5d

Tree-SHA512: a8ffa7933dce8bf994892ef16664103d7b4e1008e52628e9becb918a7727232dfb51b23100a82dc2b60cd9af5877abc32dc2d3754a7e1b3ac5410a92fdf393f3

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