- update to 2.1

- remove build patches

New features in this release:

- By default, functions and global variables are marked as "static" permitting compilers to optimize more aggressivELY IN SOme cases.
- We now try harder to get auto-vectorizers and other loop optimizers in trouble by generating code that is more idiomatic and therefore more likely to be optimized. In particular, array indices are in-bounds by construction instead of by using % operators.
- Unions are supported.
- The comma operator is supported, as in x = (y, 1, z, 3).
- Embedded assignments are supported, as in x = 1 + (y = z).
- The pre/post increment/decrement operators are supported.
- A --no-safe-math mode was added, which avoids calling the safe math wrappers. This is useful when trying to crash compilers but the resulting executables should not be run since they are very likely to have undefined behavior.

Feature safe:	yes

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