meson: Make -Werror optional
We don't want to force -Werror on everyone, because some compilers may give more warnings and some add new warnings, and this should not become a problem when a user compiles the software on some untested envionment.
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We don't want to force -Werror on everyone, because some compilers may give more warnings and some add new warnings, and this should not become a problem when a user compiles the software on some untested envionment.