gbm.rs: API diff with and without serde feature

# ran on commit 196f28efb983130341cc5c24c3758abecae0d921 (Add serde feature that adds derive({S,Des}erialize) on BufferObjectFlags)

$ cargo public-api diff @~..@
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$ cargo public-api --all-features diff @~..@
... compiling ...
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+impl serde::ser::Serialize for gbm::BufferObjectFlags
+pub fn gbm::BufferObjectFlags::serialize<__S>(&self, __serializer: __S) -> core::result::Result<<__S as serde::ser::Serializer>::Ok, <__S as serde::ser::Serializer>::Error> where __S: serde::ser::Serializer
+impl<'de> serde::de::Deserialize<'de> for gbm::BufferObjectFlags
+pub fn gbm::BufferObjectFlags::deserialize<__D>(__deserializer: __D) -> core::result::Result<Self, <__D as serde::de::Deserializer>::Error> where __D: serde::de::Deserializer<'de>
+impl<T> serde::de::DeserializeOwned for gbm::BufferObjectFlags where T: for<'de> serde::de::Deserialize<'de>