Add "weak" declarations of symbols used in safestack.h and lhash.h
Only for SunCC for now. It turns out that some compilers to generate external variants of unused static inline functions, and if they use other external symbols, those need to be present as well. If you then happen to include one of safestack.h or lhash.h without linking with libcrypto, the build fails. Fixes #6912 Signed-off-by: NMatthias Kraft <Matthias.Kraft@softwareag.com> Reviewed-by: NPaul Dale <paul.dale@oracle.com> Reviewed-by: NRichard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/8087) (cherry picked from commit 6638b2214761b5f30300534e0fe522448113c6cf)
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