tools: fix build without LIBCRYPTO support

Commit cb9faa6f98ae ("tools: Use a single target-independent config to
enable OpenSSL") introduced a target-independent configuration to build
crypto features in host tools.

But since commit 2c21256b27d7 ("hash: Use Kconfig to enable hashing in
host tools and SPL") the build without OpenSSL is broken, due to FIT
signature/encryption features. Add missing conditional compilation
tokens to fix this.

Signed-off-by: Paul-Erwan Rio <paulerwan.rio@gmail.com>
Tested-by: Alexander Dahl <ada@thorsis.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/image-host.c b/tools/image-host.c
index ca49503..90bc9f9 100644
--- a/tools/image-host.c
+++ b/tools/image-host.c
@@ -14,8 +14,10 @@
 #include <image.h>
 #include <version.h>
 
+#if CONFIG_IS_ENABLED(FIT_SIGNATURE)
 #include <openssl/pem.h>
 #include <openssl/evp.h>
+#endif
 
 /**
  * fit_set_hash_value - set hash value in requested has node
@@ -1131,6 +1133,7 @@
 	return 0;
 }
 
+#if CONFIG_IS_ENABLED(FIT_SIGNATURE)
 /*
  * 0) open file (open)
  * 1) read certificate (PEM_read_X509)
@@ -1239,6 +1242,7 @@
  out:
 	return ret;
 }
+#endif
 
 int fit_cipher_data(const char *keydir, void *keydest, void *fit,
 		    const char *comment, int require_keys,