cmake doesn't check for presence of yaml-cpp

[tdaede]

[grevaillot]

+1 - debian/ubuntu build instructions are up to date but not following them make build fails as check is not done :)

In file included from ~/tools/scopehal-cmake/lib/scopehal/scopehal.cpp:35:
~/tools/scopehal-cmake/lib/scopehal/scopehal.h:47:10: fatal error: yaml-cpp/yaml.h: No such file or directory
   47 | #include <yaml-cpp/yaml.h>
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [lib/scopehal/CMakeFiles/scopehal.dir/build.make:76: lib/scopehal/CMakeFiles/scopehal.dir/scopehal.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:316: lib/scopehal/CMakeFiles/scopehal.dir/all] Error 2
make: *** [Makefile:130: all] Error 2
zsh: exit 2     make

[azonenberg]

@tarunik want to work on this one when you're finished with the static analysis stuff?

[tarunik]

This is being fixed by pulling in the FindYaml.cmake from https://github.com/lbaehren/CMakeModules/blob/master/FindYaml.cmake