[Open1x-xsupplicant] BUG and FIX for TLS when using chained certificates in xsupplicant version 1.0.1

[Benjamin R. <br...@al...>]

We use chained certificates with TLS and xsupplicant was not sending the 
full chain when doing the TLS handshake which resulted in a failure.

We were about to fix the problem by using 
SSL_CTX_use_certificate_chain_file() in tls_funcs.c rather than 
SSL_CTX_use_certificate_file().

ben