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C implementation of C++ Utility functions https://en.cppreference.com/w/cpp/utility/intcmp

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# Integer Comparison Macros
C implementation of C++ Utility functions https://en.cppreference.com/w/cpp/utility/intcmp

## `cmp_equal`, `cmp_not_equal`, `cmp_less`, `cmp_greater`, `cmp_less_equal`, `cmp_greater_equal`

In the synopses in this subclause, integer indicates that the argument shall be an expression of real integer type:

```c
bool cmp_equal(integer lhs, integer rhs);
bool cmp_not_equal(integer lhs, integer rhs);
bool cmp_less(integer lhs, integer rhs);
bool cmp_greater(integer lhs, integer rhs);
bool cmp_less_equal(integer lhs, integer rhs);
bool cmp_greater_equal(integer lhs, integer rhs);
```

Compare the values of two integers `lhs` and `rhs`. Unlike builtin comparison operators, negative signed integers always compare "less than" (and "not equal to") unsigned integers: the comparison is safe against lossy integer conversion.

```c
-1 > 0u; // true
std::cmp_greater(-1, 0u); // false
```
 
It is a compile-time error if either `lhs` or `rhs` is not a signed or unsigned integer type (including standard integer type and extended integer type). It is also a compile-time error if the either `lhs` or `rhs` is the `char` and `bool` type.  While technically integer types, the `char` type should only be used to represent character values where the signedness is unimportant and the 'bool' type is always unsigned.

```c
cmp_greater_equal(1.0, -1.0) ? puts("true") : puts("false"); // type double, doesn't compile
cmp_greater((char)-1, (char)1) ? puts("true") : puts("false"); // type char, doesn't compile
cmp_greater((_Bool)0, (_Bool)1) ? puts("true") : puts("false"); // type _Bool, doesn't compile
```

## Parameters
`lhs` - left-hand argument

`rhs` - right-hand argument

## Return value

`cmp_equal` returns `true` if `lhs` is equal to `rhs`.

`cmp_not_equal` returns `true` if `lhs` is not equal to `rhs`.

`cmp_less` returns `true` if `lhs` is less than `rhs`.

`cmp_greater` returns `true` if `lhs` is greater than `rhs`.

`cmp_less_equal` returns `true` if `lhs` is less or equal to `rhs`.

`cmp_greater_equal` returns `true` if `lhs` is greater or equal to `rhs`.

## Portability, Safety, & Security
Define the `CMP_INT_WANT_PORTABLE` macro to `1` for the most portable implementation of these facilities. This macro will disable the use of GNU statement expressions and other extensions that protect against unintended duplicate side effects during macro expansion. For this reason, the macro defaults to requesting the nonportable interfaces that are more hygenic.

These interfaces require compiling with support for C11 functionality, even when requesting maximal portability.

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