Fix CI failures on develop from the API performance stack

- Mark the parameters of the new out-of-line throw helpers in json.hpp as
  used, as JSON_THROW drops its argument with JSON_NOEXCEPTION (clang
  -Wunused-parameter).
- all_children_leaves() iterates with begin()/end() via std::all_of: a
  custom array_t such as the one in the custom_array_type example has no
  rbegin() (examples check, clang-tidy readability-use-anyofallof).
- The rvalue to_json overloads (#5837) copy the elements of containers
  with const elements such as std::set instead of moving them: GCC 4.9's
  std::move_iterator cannot bind them. Object types are ruled out before
  std::ranges::view is checked, which needs an incomplete ordered_json
  for its object_t (GCC 11, C++20, unit-regression3 #3312).
- NOLINT the rvalue to_json parameters that are deliberately not
  forwarded, and fix the other clang-tidy findings (modernize-use-auto in
  zmij.hpp, readability-math-missing-parentheses in json_pointer.hpp).
- cpplint: NOLINT(readability/braces) on the new scalar fast-path macro
  like on JSON_IMPLEMENT_OPERATOR, and include <map> in json.hpp.
- Tests: drop a useless cast (GCC -Wuseless-cast) and a signed/unsigned
  comparison (MSVC C4018), wrap a vector<json> comparison in parentheses
  so doctest does not try to print it (ambiguous operator<< on MSVC), and
  also strip JSON_DIAGNOSTIC_POSITIONS' "(bytes x-y) " from the patch
  messages in unit-throw_messages.
- Windows clang (MinGW): link with LLD. unit-msgpack.cpp (C++11) and
  unit-regression2.cpp (C++20) have more than 32767 sections again
  (33363 and 33197), which GNU ld cannot link; LLD links them.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

.github/workflows/windows.yml

@@ -166,19 +166,21 @@ jobs:
       # link, but the binaries clang 11.0.1 and clang 18.1.8 then produce crash
       # before doctest prints its first line - 39 of 102 tests on clang 18.
       # Keep the objects small by splitting the test files instead.
-      # Objects with more than 65535 sections fail to link with "relocation
-      # truncated to fit: IMAGE_REL_AMD64_REL32 against `.rdata'": the MinGW
-      # linker stores the section an associative COMDAT section belongs to in
-      # 16 bits (x_associated in binutils' include/coff/internal.h), so it
-      # discards the jump tables of inline functions together with the wrong
-      # function. Each basic_json specialization a test file instantiates adds
-      # many sections, so test a second one in a file of its own.
+      # The tests link with LLD: GNU ld fails on objects with more than 32767
+      # sections with "relocation truncated to fit: IMAGE_REL_AMD64_REL32
+      # against `.rdata'", as it stores the section an associative COMDAT
+      # section belongs to in 16 bits (x_associated in binutils'
+      # include/coff/internal.h) and so discards the jump tables of inline
+      # functions together with the wrong function. Each basic_json
+      # specialization and input type a test file instantiates adds many
+      # sections, so unit-msgpack.cpp and unit-regression2.cpp kept crossing
+      # that limit as the library grew.
       - name: Run CMake
         run: cmake -S . -B build ^
              -DCMAKE_CXX_COMPILER="C:/Program Files/LLVM/bin/clang++.exe" ^
              -DCMAKE_CXX_FLAGS="--target=x86_64-w64-mingw32 -stdlib=libstdc++ -pthread" ^
              -DCMAKE_CXX_FLAGS_DEBUG="-g0" ^
-             -DCMAKE_EXE_LINKER_FLAGS="-lwinpthread" ^
+             -DCMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld -lwinpthread" ^
              -G"MinGW Makefiles" ^
              -DCMAKE_BUILD_TYPE=Debug ^
              -DJSON_BuildTests=On