[PATCH] Makefile: Add NEEDS_CRYPTO_WITH_SSL

The Makefile comment for NEEDS_SSL_WITH_CRYPTO says to define it "if you need -lcrypto with -lssl (Darwin)." However, what it actually does is add -lssl when you use -lcrypto and not the other way around. However, libcrypto contains a majority of the ERR_* functions from OpenSSL (at least on OS X) so we need it both ways.

So, add NEEDS_CRYPTO_WITH_SSL which adds -lcrypto to the OpenSSL link flags and clarify the difference between it and NEEDS_SSL_WITH_CRYPTO. ---

 After adding BLK_SHA1 to my config.mak, git-imap-send started giving me link
 errors:

  Undefined symbols:
    "_ERR_get_error", referenced from:
        _ssl_socket_perror in imap-send.o
    "_ERR_error_string", referenced from:
        _ssl_socket_perror in imap-send.o

 Some investigation led me to the fact that BLK_SHA1 removes LIB_4_CRYPTO from
 EXTLIBS.  That let me find the missing functions in libcrypto.  At first I
 considered making NEEDS_SSL_WITH_CRYPTO add -lcrypto to the SSL build flags
 but decided to go this route in case there are platforms that need it one way
 around and not the other.

 I've enabled this build option by default on Darwin but nowhere else.  If you
 can't build git-imap-send (with SSL) after enabling BLK_SHA1, your platform
 may need this flag as well.

 Makefile |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)