fanquake de28c348a0
Merge bitcoin/bitcoin#22814: build: Add ability to build qt in depends with -stdlib=libc++
33796a964a8c605ce482959456d1ca78638340d9 build: Add ability to build qt in depends with -stdlib=libc++ (Hennadii Stepanov)

Pull request description:

  This PR makes possible to build the `qt` package in depends against `libc++` for x86_64 platform.

  Fixes #22344.

  Required for #22815.

  Also this PR [fixes](https://github.com/bitcoin/bitcoin/pull/23060#discussion_r716077050) the `[no wallet] [bionic]` task on CI:
  - on master (a8bbd4cc819633ec50ed0f763b6a75330ae055fb), https://api.cirrus-ci.com/v1/task/5558609250615296/logs/ci.log:
  ```
  Options used to compile and link:
    external signer = yes
    multiprocess    = no
    with libs       = yes
    with wallet     = no
    with gui / qt   = no
  ```
  - this PR, https://api.cirrus-ci.com/v1/task/5502605561430016/logs/ci.log:
  ```
  Options used to compile and link:
    external signer = yes
    multiprocess    = no
    with libs       = yes
    with wallet     = no
    with gui / qt   = yes
  ```

ACKs for top commit:
  fanquake:
    ACK 33796a964a8c605ce482959456d1ca78638340d9 - While this sort of string matching is fragile, I think the risk of this causing any actual issues is low.

Tree-SHA512: 586dde2e9864cec7a49aeb4f2b77fb8c4ae96bd10b51f9c6de0cfe8512ad61db15bb7f8d1b0eb6a5a66fd2deee52ac52218f01eb6be107ac12f1a956190de54b
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