Add define guards to avoid multi-inclusion

Add define guards to avoid multi-inclusion

This header files are included by multiple other headers.
It's better to add define guards to prevent multi-inclusion.
Adhere to the coding style, all preprocessor directives inside
the guards gain a space.

Signed-off-by: Weiguo Li <liwg06@foxmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/17666)