[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Support for musl when building the VM for embedded system (#304)

[Xuan Sang LE]

I just do a check, there are two minor problems with Musl:

1. Musl does not provide any predefined macro in order to test for its presence, like GLIBC
2. The struct _IO_FILE  is defined in ```src/internal/stdio_impl.h```, but it is not a public API and is subject to change in the future.

For the fist problem, we can just use some thing like this:
```c
#ifdef __MUSL__
// do some stuffs
#endif
```
Then, when one want to compile again Musl, just add the ```-D__MUSL__``` to the ```CFLAGS``` when executing the configure script.

For the second problem, the added explicit definition (as i did) is not guaranteed to work in the future version of Musl since the ```struct _IO_FILE``` may be changed. It would be nice if we can find a workaround that does not involve the (re)definition of that struct.



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