SDL3/SDL_FLT_EPSILON: Create simple stub for SDL FLT EPSILON constant so no deadlinks are present

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[MrOnlineCoder]

Cannot unfortunately find a way to provide edits to the PR, so leaving updated file there:

###### (This is the documentation for SDL3, which is under heavy development and the API is changing! [SDL2](https://wiki.libsdl.org/SDL2/) is the current stable version!)
# SDL_FLT_EPSILON

Internal SDL epsilon constant, used for comparing floating-point numbers. Equals by default to platform-defined [FLT_EPSILON](https://en.cppreference.com/w/cpp/header/cfloat). Otherwise, uses a constant of ` 1.1920928955078125e-07F` or `0x0.000002p0`

## Header File

Defined in [<SDL3/SDL_stdinc.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_stdinc.h)

## Syntax

```c
#ifdef FLT_EPSILON
#define SDL_FLT_EPSILON FLT_EPSILON
#else
#define SDL_FLT_EPSILON 1.1920928955078125e-07F /* 0x0.000002p0 */
#endif

Version

This macro is available since SDL 3.0.0.

See Also

• SDL_bool

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CategoryAPI, CategoryAPIMacro, CategoryStdinc

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