Merge #17730: depends: remove Qt networking features

244501fc85a1319857efb227093c0e71c1d5a01e depends: disable unused qt networking features (fanquake)
29d56c62b7f206d42f0908819ff2e1926737f988 depends: -optimized-qmake is now -optimized-tools (fanquake)
ccdda96804088ec3ad01aec5ab0ff8e9b05b161b depends: skip building qt proxies (fanquake)

Pull request description:

  Somewhat of a followup to removing BIP70 support in #17165. This removes networking features from our Qt build. This also removes the need to link against the `CFNetwork` and `SystemConfiguration` libraries on macOS.

  ```diff
  src/qt/bitcoin-qt:
   /usr/lib/libSystem.B.dylib
   /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
   /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
   /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
   /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
   /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
   /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
  -/System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
   /System/Library/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics
   /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
   /usr/lib/libc++.1.dylib
  -/System/Library/Frameworks/CFNetwork.framework/Versions/A/CFNetwork
   /System/Library/Frameworks/CoreText.framework/Versions/A/CoreText
   /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
   /usr/lib/libobjc.A.dylib
  ```

  > Introduced the -optimized-tools option; supersedes -optimized-qmake.

  `optimized-qmake` became `optimized-tools` in Qt 5.6.0. While the former still works, we can use the newer flag.

  A diff of the removed symbols is available [here](https://gist.github.com/fanquake/9c8d5961c91f90a2966191367adfb391).

  We still need to actually build the network module, because we are using `QLocalServer` & `QLocalSocket` in the payment server.

ACKs for top commit:
  Sjors:
    Code review ACK 244501fc85a1319857efb227093c0e71c1d5a01e: just a rebase (_updated since I accidentally repeated the previous hash_)
  practicalswift:
    ACK 244501fc85a1319857efb227093c0e71c1d5a01e -- diff looks correct
  promag:
    Code review ACK 244501fc85a1319857efb227093c0e71c1d5a01e.

Tree-SHA512: 79734e3c96c40e7e484c86ac4cd4f738c05fcebe4771aeac443883f618a6c766e667909d5f8f14f9bd82f43206387c952458c5fa765cd0830f8beda6e6ac80ae

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