The version is 0.4.1 (instead of suggested 0.5.0) since it
introduces no backwards-incompatible changes.
Only version is actually changed, no code modifications.
Initial commit adding support for detection of SGX. Not tested yet.
Increment version number due to binary incompatibility of the
sizes of cpu_raw_data_t and cpu_id_t.
Previously, 0.2.1 was mentioned in libcpuid.h, but this was not,
actually, in effect; it wasn't mentioned in autoconf and Visual Studio
project files. Also, cpuid_lib_version() still returned "0.2.0".
