Add legacy include guards to public header files

For every public header file, the old include guard definition needs
to be added in addition to the new one

include/openssl/file.h:

    #ifndef OPENSSL_FILE_H
    # define OPENSSL_FILE_H
    # pragma once

    # include <openssl/macros.h>
    # if !OPENSSL_API_3
    #  define HEADER_FILE_H
    # endif
    ...

This is going to ensure that applications which use the old include guards
externally, for example like this

    #ifndef HEADER_FILE_H
    # include <openssl/file.h>
    #endif

will not fail to compile.

In addition to the legacy guard, the public header files also receive a
'# pragma once' directive.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9333)

0 files changed, 0 insertions, 0 deletions