Merge branch 'cbindgen' into 'master'

Fix cbindgen for disabled headers

See merge request redox-os/relibc!237

src/header/_aio/cbindgen.toml

@@ -2,7 +2,8 @@ sys_includes = []
 include_guard = "_AIO_H"
 language = "C"
 style = "Tag"
-no_default_includes = true
+no_includes = true
+cpp_compat = true
 
 [enum]
 prefix_with_name = true

src/header/_fenv/cbindgen.toml

@@ -2,7 +2,8 @@ sys_includes = ["stdint.h", "sys/types.h"]
 include_guard = "_FENV_H"
 language = "C"
 style = "Tag"
-no_default_includes = true
+no_includes = true
+cpp_compat = true
 
 [enum]
 prefix_with_name = true