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.

Signed-off-by: Brian Gernhardt <brian@gernhardtsoftware.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -91,7 +91,9 @@ all::
 # Define PPC_SHA1 environment variable when running make to make use of
 # a bundled SHA1 routine optimized for PowerPC.
 #
-# Define NEEDS_SSL_WITH_CRYPTO if you need -lcrypto with -lssl (Darwin).
+# Define NEEDS_CRYPTO_WITH_SSL if you need -lcrypto when using -lssl (Darwin).
+#
+# Define NEEDS_SSL_WITH_CRYPTO if you need -lssl when using -lcrypto (Darwin).
 #
 # Define NEEDS_LIBICONV if linking with libc is not enough (Darwin).
 #
@@ -704,6 +706,7 @@ ifeq ($(uname_S),SCO_SV)
 	TAR = gtar
 endif
 ifeq ($(uname_S),Darwin)
+	NEEDS_CRYPTO_WITH_SSL = YesPlease
 	NEEDS_SSL_WITH_CRYPTO = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	ifeq ($(shell expr "$(uname_R)" : '[15678]\.'),2)
@@ -1007,6 +1010,9 @@ ifndef NO_OPENSSL
 	else
 		OPENSSL_LINK =
 	endif
+	ifdef NEEDS_CRYPTO_WITH_SSL
+		OPENSSL_LINK += -lcrypto
+	endif
 else
 	BASIC_CFLAGS += -DNO_OPENSSL
 	BLK_SHA1 = 1