The current header generation uses old style Objective C
getters/setters. This causes Swift to incorrectly bridge properties as
methods. Using @property lets you write goObj.str = "value" (vs
goObj.setStr("value")).
Change-Id: I99d63743623734414edd50343dbdded52bdf2bf5
GitHub-Last-Rev: fb0ad7ec50d25ae5aa75ed729b04b95b99672f04
GitHub-Pull-Request: golang/mobile#27
Reviewed-on: https://go-review.googlesource.com/c/159618
Reviewed-by: Elias Naur <mail@eliasnaur.com>