Fix compilation failing for runtime

When i try to compile runtime lib for next contributing i have 2 problems
1 fail note on const char* and char* but whe i fix declaration i have problem with php_stream_open_wrapper_ex
2 
```
/usr/local/include/llvm/Support/DataTypes.h:48:3: erreur: #error "Must #define __STDC_LIMIT_MACROS before #including Support/DataTypes.h"
/usr/local/include/llvm/Support/DataTypes.h:52:3: erreur: #error "Must #define __STDC_CONSTANT_MACROS before " "#including Support/DataTypes.h"
```