Update to the SoftFloat-2c version of softfloat-macros.h. This has 3
small changes:
- Simplification of the license.
- Minor style changes to 3 comments.
- Fixes a bug in shift128Right() for shift c

Update to the SoftFloat-2c version of softfloat-macros.h. This has 3
small changes:
- Simplification of the license.
- Minor style changes to 3 comments.
- Fixes a bug in shift128Right() for shift counts >= 64;

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Update to the SoftFloat-2b version of softfloat-macros.h. This makes a
clarifying change to the warranty disclaimer and updates the comments. NFC.

o IEEE 754 floating-point completion code.
o Implement the architected FP_C "Floating Point Control Quadword"