improve DST-related error messages #67

Job	Run time
sdist	30s
build on linux (x86_64) (auto)	1m 36s
build on linux (x86) (auto)	2m 3s
build on linux (aarch64) (auto)	1m 56s
build on linux (armv7) (auto)	1m 59s
build on linux (ppc64le) (auto)	1m 50s
build on linux (s390x) (auto)	1m 58s
build on linux (x86_64) (musllinux_1_2)	1m 31s
build on linux (x86) (musllinux_1_2)	1m 30s
build on linux (aarch64) (musllinux_1_2)	1m 23s
build on linux (armv7) (musllinux_1_2)	1m 26s
build on windows (x86_64) (auto)	3m 35s
build on windows (x86) (auto)	3m 46s
build on macos (x86_64) (auto)	1m 3s
build on macos (aarch64) (auto)	56s
Release	1m 51s
	28m 53s

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