include linux/personality.h on android
include linux/personality.h on android

sys/personality.h is present only since android platform level 21. The
linux/ version is present everywhere.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@292935 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb