Update core version to 0.92.4

[jpsim]

This expects core's tarball to have the following structure:

LICENSE
include/
librealm-dbg.a
librealm-ios-bitcode-dbg.a
librealm-ios-bitcode.a
librealm-ios-dbg.a -> librealm-ios-bitcode-dbg.a
librealm-ios-no-bitcode-dbg.a
librealm-ios-no-bitcode.a
librealm-ios.a -> librealm-ios-bitcode.a
librealm-watchos-dbg.a
librealm-watchos.a
librealm.a
release_notes.txt

This automatically switches core bitcode symlink when building the "iOS Dynamic" target of Realm.xcodeproj.

Once this is merged, we'll need to update the swift-1.2 branch's Realm.podspec to use s.ios.vendored_library = librealm-ios-no-bitcode.a. This way, we can point CocoaPods users of Realm Objective-C who can't update to Xcode 7 to point to the swift-1.2 branch. This will also support CP users of Realm Swift.

To be extra safe, we should probably also be running set-core-bitcode-symlink when building the static iOS framework target (EDIT: Done).

/cc @tgoyne @bdash

[gintechsystems]

So how do we fix this to work with CocoaPods 0.39.0? I am getting an error saying RLMResults.h not found and am using 0.95 Realm, objective-c.

[gintechsystems]

I was able to fix the issue by downgrading to 0.38.0 of CocoaPods.