qtquick3d examples fail to build for QNX

Examples fail to build for QNX with:

qtbase/lib/libQt6ShaderTools.so.6.2.0: undefined reference to `nl_langinfo(int)'

QNX does support ln_langinfo but langinfo.h from toolchain don't have 'extern "C"'.

Possible solutions are adding extern "C" for #include <langinfo.h> in qtshadertools/src/3rdparty/SPIRV-Cross/spirv-glsl.cpp or use same fall back as older Androids and Integrity are using since they don't support ln_langinfo