Remove superfluous OpenSSL include paths.

The libcrypto and libssl modules (and their respective static and host
versions) use LOCAL_EXPORT_C_INCLUDE_DIRS thus just including the module
is sufficient.

Additionally, cryptfs.h was including an OpenSSL header just to get the
length of a SHA-256 hash. Rather than force all users of this header to
also depend on libcrypto, it's easier just to define that value in the
header file.

Change-Id: I3e3e0db906a212e1093944b298e4a8ff2e2fb07d
diff --git a/cryptfs.c b/cryptfs.c
index aaa2b86..8747540 100644
--- a/cryptfs.c
+++ b/cryptfs.c
@@ -36,6 +36,7 @@
 #include <string.h>
 #include <sys/mount.h>
 #include <openssl/evp.h>
+#include <openssl/sha.h>
 #include <errno.h>
 #include <ext4.h>
 #include <linux/kdev_t.h>