Merge tag 'pr-plugins-20260129' of https://gitlab.com/pbo-linaro/qemu into staging

Changes:
- contrib/plugins/hotblocks: Minor bug fixes and add limit argument (Alex Bradbury <asb@igalia.com>)
- linux-user: introduce syscall-filter plugin API (Ziyang Zhang <functioner@sjtu.edu.cn>)
- plugins: return bool from register r/w API (Florian Hofhammer <florian.hofhammer@fhofhammer.de>)
- plugins: enable C++ plugins (Pierrick Bouvier <pierrick.bouvier@linaro.org>)
- plugins: reduce source conflicts in plugins list (Pierrick Bouvier <pierrick.bouvier@linaro.org>)

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* tag 'pr-plugins-20260129' of https://gitlab.com/pbo-linaro/qemu: (21 commits)
  plugins: reduce source conflicts in plugins list
  contrib/plugins: add empty cpp plugin
  meson: update C++ standard to C++23
  qga/vss-win32: fix clang warning with C++20
  meson: enable cpp (optionally) for plugins
  meson: fix supported compiler arguments in other languages than C
  plugins: move qemu-plugin.h to include/plugins/
  tests/tcg/plugins/mem.c: remove dependency on qemu headers
  plugins: define plugin API symbols as extern "C" when compiling in C++
  plugins: use complete filename for defining plugins sources
  plugins: factorize plugin dependencies and library details
  plugins: move win32_linker.c file to plugins directory
  plugins: return bool from register r/w API
  tcg tests: add a test to verify the syscall filter plugin API
  linux-user: add plugin API to filter syscalls
  linux-user: move user/syscall-trace.h to linux-user/syscall.c
  contrib/plugins/hotblocks: Allow limit to be set as a command line argument
  docs/about/emulation: Add documentation for hotblocks plugin arguments
  contrib/plugins/hotblocks: Print uint64_t with PRIu64 rather than PRId64
  contrib/plugins/hotblocks: Fix off by one error in iteration of sorted blocks
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>