Remove `printf`. #1130

Job	Run time
bazel-build	1m 24s
macosx-build	12m 4s
bigendian	11m 44s
mingw-build (--host=x86_64-w64-mingw32)	2m 8s
standard-build (--enable-debug --enable-cuckoo --enable-magic --enable-macho --enable-pb-tests --...	2m 57s
mingw-build (--host=i686-w64-mingw32)	1m 47s
standard-build (--enable-debug --enable-profiling --enable-cuckoo --enable-magic --enable-macho -...	2m 21s
	34m 25s

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