Merge bitcoin#17730: depends: remove Qt networking features

244501f depends: disable unused qt networking features (fanquake)
29d56c6 depends: -optimized-qmake is now -optimized-tools (fanquake)
ccdda96 depends: skip building qt proxies (fanquake)

Pull request description:

  Somewhat of a followup to removing BIP70 support in bitcoin#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 244501f: just a rebase (_updated since I accidentally repeated the previous hash_)
  practicalswift:
    ACK 244501f -- diff looks correct
  promag:
    Code review ACK 244501f.

Tree-SHA512: 79734e3c96c40e7e484c86ac4cd4f738c05fcebe4771aeac443883f618a6c766e667909d5f8f14f9bd82f43206387c952458c5fa765cd0830f8beda6e6ac80ae

depends/packages/qt.mk

@@ -39,12 +39,14 @@ $(package)_config_opts += -no-iconv
 $(package)_config_opts += -no-kms
 $(package)_config_opts += -no-linuxfb
 $(package)_config_opts += -no-libjpeg
+$(package)_config_opts += -no-libproxy
 $(package)_config_opts += -no-libudev
 $(package)_config_opts += -no-mtdev
 $(package)_config_opts += -no-openssl
 $(package)_config_opts += -no-openvg
 $(package)_config_opts += -no-reduce-relocations
 $(package)_config_opts += -no-qml-debug
+$(package)_config_opts += -no-sctp
 $(package)_config_opts += -no-securetransport
 $(package)_config_opts += -no-sql-db2
 $(package)_config_opts += -no-sql-ibase
@@ -55,12 +57,13 @@ $(package)_config_opts += -no-sql-odbc
 $(package)_config_opts += -no-sql-psql
 $(package)_config_opts += -no-sql-sqlite
 $(package)_config_opts += -no-sql-sqlite2
+$(package)_config_opts += -no-system-proxies
 $(package)_config_opts += -no-use-gold-linker
 $(package)_config_opts += -no-xinput2
 $(package)_config_opts += -nomake examples
 $(package)_config_opts += -nomake tests
 $(package)_config_opts += -opensource
-$(package)_config_opts += -optimized-qmake
+$(package)_config_opts += -optimized-tools
 $(package)_config_opts += -pch
 $(package)_config_opts += -pkg-config
 $(package)_config_opts += -prefix $(host_prefix)
@@ -79,16 +82,20 @@ $(package)_config_opts += -no-feature-dial
 $(package)_config_opts += -no-feature-filesystemwatcher
 $(package)_config_opts += -no-feature-fontcombobox
 $(package)_config_opts += -no-feature-ftp
+$(package)_config_opts += -no-feature-http
 $(package)_config_opts += -no-feature-image_heuristic_mask
 $(package)_config_opts += -no-feature-keysequenceedit
 $(package)_config_opts += -no-feature-lcdnumber
+$(package)_config_opts += -no-feature-networkdiskcache
+$(package)_config_opts += -no-feature-networkproxy
 $(package)_config_opts += -no-feature-pdf
 $(package)_config_opts += -no-feature-printdialog
 $(package)_config_opts += -no-feature-printer
 $(package)_config_opts += -no-feature-printpreviewdialog
 $(package)_config_opts += -no-feature-printpreviewwidget
 $(package)_config_opts += -no-feature-regularexpression
 $(package)_config_opts += -no-feature-sessionmanager
+$(package)_config_opts += -no-feature-socks5
 $(package)_config_opts += -no-feature-sql
 $(package)_config_opts += -no-feature-statemachine
 $(package)_config_opts += -no-feature-syntaxhighlighter