sqlx has same dependencies with and without macros feature

[vkgnosis]

• Create an empty project: cargo init --bin foo
• Depend on sqlx with minimal features: `sqlx = { version = "0.4", default-features = false, features = ["runtime-async-std-native-tls"] }
• cargo tree > dependencies0
• Add the macros feature sqlx = { version = "0.4", default-features = false, features = ["runtime-async-std-native-tls", "macros"] }
• cargo tree > dependencies1
• diff dependencies0 dependencies1 shows the files are the same

It is surprising to me that the dependencies are the same. I expected less dependencies without the feature as these kind of features are usually used to reduce compilation time.

[abonander]

Duplicate of #955