Merge bitcoin/bitcoin#31315: build: Enable -Wbidi-chars=any

fa7857c build: Enable -Wbidi-chars=any (MarcoFalke)

Pull request description:

  I don't see a use-case for UTF-8 bidirectional control characters in this codebase. So disable them for now.

  Ref: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wbidi-chars_003d

ACKs for top commit:
  fanquake:
    ACK fa7857c

Tree-SHA512: 29cf78a2bd0fd94f919f4cd1d1038009a574b4d011146c69bf94d3c06951606200b7d1f827ac6f2fb4540e8f45118ba72b3ccf6c20ef8048e819974371d8f67a

Author: fanquake

CMakeLists.txt

@@ -417,6 +417,7 @@ else()
   try_append_cxx_flags("-Wunreachable-code" TARGET warn_interface SKIP_LINK)
   try_append_cxx_flags("-Wdocumentation" TARGET warn_interface SKIP_LINK)
   try_append_cxx_flags("-Wself-assign" TARGET warn_interface SKIP_LINK)
+  try_append_cxx_flags("-Wbidi-chars=any" TARGET warn_interface SKIP_LINK)
   try_append_cxx_flags("-Wundef" TARGET warn_interface SKIP_LINK)
 
   # Some compilers (gcc) ignore unknown -Wno-* options, but warn about all