For Travis CI - fix Linux RPM packaging and iOS 64-bit packaging.
[ci package]

Travis-CI Ubuntu build environment requires additional software package to generate RPM package.
Travis-CI does not like iOS 64-bit build that generates >4MB log and kills the build process. Workaround by trying to rebuild universal binary quietly, hopefully the rebuild would not exceeds 10 minutes or otherwise Travis-CI would kill the process again for the other reason: no log activity. Finger cross.
For Travis CI - switch CI build to use OS X build environment.