Add security override for sha1 #17

Job	Run time
windows-latest msys2 [msystem ucrt64; backend botan; build shared libs on; GnuPG stable]	8m 33s
windows-latest msys2 [msystem ucrt64; backend botan; build shared libs on; GnuPG stable]	8m 33s
windows-latest msys2 [msystem ucrt64; backend openssl; build shared libs on; GnuPG stable]	7m 12s
windows-latest msys2 [msystem ucrt64; backend openssl; build shared libs on; GnuPG stable]	7m 12s
windows-latest msys2 [msystem mingw64; backend botan; build shared libs on; GnuPG stable]	8m 20s
windows-latest msys2 [msystem mingw64; backend botan; build shared libs on; GnuPG stable]	8m 20s
windows-latest msys2 [msystem mingw64; backend openssl; build shared libs on; GnuPG stable]	7m 14s
windows-latest msys2 [msystem mingw64; backend openssl; build shared libs on; GnuPG stable]	7m 14s
windows-latest msys2 [msystem clang64; backend botan; build shared libs on; GnuPG stable]	8m 9s
windows-latest msys2 [msystem clang64; backend botan; build shared libs on; GnuPG stable]	8m 9s
windows-latest msys2 [msystem clang64; backend openssl; build shared libs on; GnuPG stable]	3m 27s
windows-latest msys2 [msystem clang64; backend openssl; build shared libs on; GnuPG stable]	7m 21s
windows-latest msys2 [msystem ucrt64; backend botan; build shared libs off; GnuPG stable]	8m 17s
windows-latest msys2 [msystem ucrt64; backend botan; build shared libs off; GnuPG stable]	8m 17s
	1h 46m 18s

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