When building with `-Werror,-Wmissing-prototypes`, `clang` complains about missing prototypes for functions defined through macro expansions. This PR adds the missing prototypes.

```
error: no previous prototype for function 'pybind11_init_impl_embedded' [
-Werror,-Wmissing-prototypes]                                           
PYBIND11_EMBEDDED_MODULE(embedded, mod) {                                             
^                                                                           
external/pybind11/include/pybind11/embed.h:61:5: note: expanded from macro 'PYBIND11_EMBEDDED_MODULE'
    PYBIND11_EMBEDDED_MODULE_IMPL(name)                                       \
    ^                                                                         
external/pybind11/include/pybind11/embed.h:26:23: note: expanded from macro 'PYBIND11_EMBEDDED_MODULE_IMPL'
      extern "C" void pybind11_init_impl_##name() {      \                  
                      ^                                             
<scratch space>:380:1: note: expanded from here                     
pybind11_init_impl_embedded                                                                                                                      
^                                                                                                                                                
1 error generated.
```