intel-intrinsics v1.4.0: SSSE3 support, SHA-256 instructions support

[Guillaume Piolat]

DUB package "intel-intrinsics" is out in version v1.4.0
Now with support for SSSE3 and SHA-256 instructions.

**Features:**
- Use intrinsics in: 
https://software.intel.com/sites/landingpage/IntrinsicsGuide/#techs=MMX,SSE,SSE2,SSE3,SSSE3
- target x86, x86_64, arm64 or arm32 (anyone actually needs 
arm32?)
- use DMD, LDC, or GDC