Mac latest OS - fails to install, without deprecations.

[gedw99]

go install github.com/github/smimesign@latest
go: downloading github.com/github/smimesign v0.2.0
go: downloading github.com/certifi/gocertifi v0.0.0-20180118203423-deb3ae2ef261
go: downloading github.com/pborman/getopt v0.0.0-20180811024354-2b5b3bfb099b
go: downloading golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734
# github.com/github/smimesign/certstore
cgo-gcc-prolog:475:11: warning: 'SecTrustEvaluate' is deprecated: first deprecated in macOS 10.15 [-Wdeprecated-declarations]
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Security.framework/Headers/SecTrust.h:364:10: note: 'SecTrustEvaluate' has been explicitly marked deprecated here
cgo-gcc-prolog:494:11: warning: 'SecTrustGetCertificateAtIndex' is deprecated: first deprecated in macOS 12.0 [-Wdeprecated-declarations]
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Security.framework/Headers/SecTrust.h:523:19: note: 'SecTrustGetCertificateAtIndex' has been explicitly marked deprecated here