Revert "build: target OSX 10.5 when building on darwin"
Revert "build: target OSX 10.5 when building on darwin"

This reverts commit b6d6a54f8057d0adad13d4bcc11eb3f443079ddc,
which fixed #3072, so we'll have to figure out another way
to make that work.

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node