Merge branch 'ps/meson-weak-sha1-build'

meson-based build now supports the unsafe-sha1 build knob. * ps/meson-weak-sha1-build: meson: provide a summary of configured backends meson: wire up unsafe SHA1 backend meson: add missing dots for build options meson: simplify conditions for HTTPS and SHA1 dependencies meson: require SecurityFramework when it's used as SHA1 backend meson: deduplicate access to SHA1/SHA256 backend options meson: consistenlty spell 'CommonCrypto'