Bump tarball version to 4.5.0 and update NEWS. #346

Job	Run time
skip_duplicates	5s
O0-Buildflags (gcc, --enable-obsolete-api --enable-hashes=all --enable-failure-tokens)	1m 56s
O0-Buildflags (gcc, --enable-obsolete-api --enable-obsolete-api-enosys --enable-hashes=all --enab...	2m 34s
O0-Buildflags (gcc, --disable-obsolete-api --enable-hashes=all --enable-failure-tokens)	1m 51s
O0-Buildflags (gcc, --disable-obsolete-api --enable-failure-tokens --enable-hashes=strong)	53s
O0-Buildflags (gcc, --enable-obsolete-api --disable-failure-tokens --enable-hashes=descrypt)	33s
O0-Buildflags (clang, --enable-obsolete-api --enable-hashes=all --enable-failure-tokens)	2m 4s
O0-Buildflags (clang, --enable-obsolete-api --enable-obsolete-api-enosys --enable-hashes=all --en...	2m 12s
O0-Buildflags (clang, --disable-obsolete-api --enable-hashes=all --enable-failure-tokens)	2m 14s
O0-Buildflags (clang, --disable-obsolete-api --enable-failure-tokens --enable-hashes=strong)	57s
O0-Buildflags (clang, --enable-obsolete-api --disable-failure-tokens --enable-hashes=descrypt)	38s
	15m 57s

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