remove stddef header from glob

src/header/glob/cbindgen.toml

@@ -2,10 +2,10 @@
 #
 # Spec quotations relating to includes:
 # - "The <glob.h> header shall define the size_t type as described in <sys/types.h>."
-#
-# size_t is defined in stddef.h (sys/types.h gets size_t by including stddef.h)
-# just use stddef.h to avoid importing all of sys/types.h
-sys_includes = ["stddef.h"]
+sys_includes = []
+after_includes = """
+#include <bits/size-t.h> // for size_t from sys/types.h
+"""
 include_guard = "_RELIBC_GLOB_H"
 language = "C"
 style = "type"