coredata: Fix crash when cmd_line_options contains booleans
coredata: Fix crash when cmd_line_options contains booleans

`meson setup --debug` puts a bool object in cmd_line_options dictionary
that we have to convert to string.

Fixes: #6646

pexip/meson,pexip/meson,QuLogic/meson,jpakkane/meson,jpakkane/meson,becm/meson,becm/meson,pexip/meson,becm/meson,mesonbuild/meson,becm/meson,QuLogic/meson,pexip/meson,mesonbuild/meson,jpakkane/meson,becm/meson,QuLogic/meson,mesonbuild/meson,mesonbuild/meson,jpakkane/meson,jpakkane/meson,QuLogic/meson,mesonbuild/meson,becm/meson,jpakkane/meson,mesonbuild/meson,QuLogic/meson,pexip/meson,becm/meson,mesonbuild/meson,jpakkane/meson,becm/meson,becm/meson,pexip/meson,mesonbuild/meson,pexip/meson,becm/meson,QuLogic/meson,QuLogic/meson,jpakkane/meson,pexip/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,QuLogic/meson,QuLogic/meson,jpakkane/meson,pexip/meson