More CMake: Add flags from dpkg-buildflags to CMake flags
More CMake: Add flags from dpkg-buildflags to CMake flags

- Use same compiler flags that the Debian tools will use when generating
packages
- Don't fail due to using "__DATE__" or "__TIME__": add flag "-Wno-error
=date-time"

Kurento/kms-core,Kurento/kms-core,Kurento/kms-core,Kurento/kms-core