Linking error

[Yuriy Skalko]

I have linking error after commit 28ae543a (Fix signed-ness warnings):

src/CMakeFiles/LyX2.4.dir/output_latex.cpp.obj:output_latex.cpp:(.text+0x1b1a):
undefined reference to `unsigned long long lyx::convert<unsigned long
long, std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> > >(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >)'


Yuriy