- Disable output of empty header files

- Remove incorrect header styles
- Use export.replace where header style was previously needed
- Check compilation of tests using system gcc

src/header/sys_select/cbindgen.toml

@@ -8,5 +8,7 @@ prefix_with_name = true
 
 [export]
 # fd_set is also defined in C because cbindgen is incompatible with mem::size_of booo
-
 exclude = ["FD_SETSIZE", "fd_set"]
+
+[export.rename]
+"timeval" = "struct timeval"