pragma(mangle_prefix, "myclib_")

[ryuukk_]

Due to lack of proper namespacing in C, library authors prefix 
their symbols with the name of the library

Example: 
https://github.com/floooh/sokol/blob/master/sokol_gfx.h#L2471 
(large file)

```C
SOKOL_GFX_API_DECL void sg_setup(const sg_desc* desc);
SOKOL_GFX_API_DECL void sg_shutdown(void);
SOKOL_GFX_API_DECL bool sg_isvalid(void);
SOKOL_GFX_API_DECL void sg_reset_state_cache(void);
SOKOL_GFX_API_DECL sg_trace_hooks sg_install_trace_hooks(const 
sg_trace_hooks* trace_hooks);
SOKOL_GFX_API_DECL void sg_push_debug_group(const char* name);
SOKOL_GFX_API_DECL void sg_pop_debug_group(void);
```

Would be cool to be able to do something like this:


```D
module sokol;

pragma(mangle_prefix, "sg_"):
extern(C):

void setup(const(desc)* desc);
void shutdown();
bool isvalid();
void reset_state_cache();
trace_hooks install_trace_hooks(const trace_hooks* trace_hooks);
void push_debug_group(const(char)* name);
void pop_debug_group();
```

And use them this way:

```D
import sg = sokol; // i love this D feature, so nice to use

void main()
{
     sg.desc description;

     sg.setup(&description);

     sg.shutdown();

}
```

This way we get a nice way to contain C functions into their own 
scope without polluting the global scope

Got the idea from: 
https://odin-lang.org/docs/overview/#linking-and-foreign-attributes

If nobody finds it bad, then i can try to implement it myself, 
that doesn't look as intimidating to do as the .Enum dip