verify strings header includes

src/header/strings/cbindgen.toml

@@ -1,9 +1,22 @@
-sys_includes = ["features.h", "stddef.h", "stdint.h"]
+# POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/strings.h.html
+#
+# Spec quotations relating to includes:
+# - "The <strings.h> header shall define the locale_t type as described in <locale.h>."
+# - "The <strings.h> header shall define the size_t type as described in <sys/types.h>."
+#
+# sys/types.h gets size_t from stddef.h (just include stddef.h here instead of importing all of sys/types.h)
+# features.h required for deprecated annotations
+sys_includes = ["features.h", "stddef.h"]
 include_guard = "_RELIBC_STRINGS_H"
+after_includes = """
+#include <bits/locale-t.h> // for locale_t from locale.h
+"""
 language = "C"
 style = "Tag"
 no_includes = true
 cpp_compat = true
+# make size_t actually size_t instead of uintptr_t (which would require stdint.h)
+usize_is_size_t = true
 
 [enum]
 prefix_with_name = true