Merge lp://staging/~jelle-vdwaa/ecryptfs/ecryptfs into lp://staging/ecryptfs

libecryptfs: Handle '=' characters in mount option string values

Users cannot mount ecryptfs with "-o passphrase_passwd_file=mykey" (<mykey> is
"passwd=123=abc") or "-o passwd=123=abc". Because the passphrase user uses
includes "=" character.

Because in the manner of process_comma_tok() function, ecryptfs will store
"passwd=123" as the @current->name and "abc" as @current->value. That will go
wrong when we go into tf_pass_file() function because it cannot match the name
"passphrase_passwd" or "passwd".

Add two lines in process_comma_tok() to change that case. If we match one "="
character in the string, we don't need to loop and match another "=" again.

Add Jason's mount option parser fix to debian/changelog

Fix build with OpenSSL 1.1.x

The rsa_st struct has been made opaque in 1.1.x, add forward compatible
code to access the n, e, d members of rsa_struct.

CRYPTO_malloc_init has been removed from OpenSSL 1.1.x since the library
calls this routine by itself.

Fix build with OpenSSL 1.1.x

The rsa_st struct has been made opaque in 1.1.x, add forward compatible
code to access the n, e, d members of rsa_struct.

EVP_PKEY structure has been made opaque, use EVP_PKEY_base_id
to get the type.