Merge bitcoin/bitcoin#30144: ci: Add mising -Wno-error=maybe-uninitialized to armhf task

fa73431 ci: Add mising -Wno-error=maybe-uninitialized to armhf task (MarcoFalke)

Pull request description:

  This happens after bd597c3 in many pull requests as a silent merge conflict. For example:

  * bitcoin/bitcoin#29720 (comment)
  * bitcoin/bitcoin#29521 (comment)
  * (Probably many undetected, because the CI task was not yet re-run)
  * ...

ACKs for top commit:
  fjahr:
    utACK fa73431
  fanquake:
    ACK fa73431 - many fixed with 13.x

Tree-SHA512: 6e6ff8dc6f3c6a2abcd04c4203d3468f6e98c1ad3a4da4ad0037a9ee2cbec6bec079a5f778aba0273e38e173849927abcdfcfba7643d08ed66c1168cb89fab08

Author: fanquake

ci/test/00_setup_env_arm.sh

@@ -17,4 +17,4 @@ export RUN_FUNCTIONAL_TESTS=false
 export GOAL="install"
 # -Wno-psabi is to disable ABI warnings: "note: parameter passing for argument of type ... changed in GCC 7.1"
 # This could be removed once the ABI change warning does not show up by default
-export BITCOIN_CONFIG="--enable-reduce-exports CXXFLAGS=-Wno-psabi"
+export BITCOIN_CONFIG="--enable-reduce-exports CXXFLAGS='-Wno-psabi -Wno-error=maybe-uninitialized'"