message: build: Add ability to build qt in depends with -stdlib=libc++
diff: @@ -147,7 +147,11 @@ $(package)_config_opts_linux += -no-feature-vulkan
  $(package)_config_opts_linux += -dbus-runtime
  $(package)_config_opts_arm_linux += -platform linux-g++ -xplatform bitcoin-linux-g++
  $(package)_config_opts_i686_linux = -xplatform linux-g++-32
  +ifneq (,$(findstring -stdlib=libc++,$($(1)_cxx)))
  +$(package)_config_opts_x86_64_linux = -xplatform linux-clang-libc++
  +else
  $(package)_config_opts_x86_64_linux = -xplatform linux-g++-64
  +endif
  $(package)_config_opts_aarch64_linux = -xplatform linux-aarch64-gnu-g++
  $(package)_config_opts_powerpc64_linux = -platform linux-g++ -xplatform bitcoin-linux-g++
  $(package)_config_opts_powerpc64le_linux = -platform linux-g++ -xplatform bitcoin-linux-g++
  