Re-enable compile-time format-string checking
Re-enable compile-time format-string checking

Since the commit 691a7a9 compile-time string checking was accidently not possible anymore.
With this change, it should be possible again.
alabuzhev/fmt,alabuzhev/fmt,cppformat/cppformat,cppformat/cppformat,alabuzhev/fmt,cppformat/cppformat