meson_options: pass proper boolean values to boolean options
Passing strings has been deprecated: https://mesonbuild.com/Release-notes-for-1-1-0.html#coercing-values-in-the-option-function-is-deprecated
Passing strings has been deprecated: https://mesonbuild.com/Release-notes-for-1-1-0.html#coercing-values-in-the-option-function-is-deprecated