genprotimg: Fix build with OpenSSL 1.1

OpenSSL 1.1 seems to use a non-const parameter to X509_name_dup(), but
x509_armonk_locality_fixup() is passing a const there. The compile then
fails on "discards 'const' qualifier", when -Werror is used. Thus
resolve with a type-cast like in c2b_name().

Fixes: #167
Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Dan Horák <dan@danny.cz>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>

genprotimg/src/utils/crypto.c

@@ -768,7 +768,7 @@ static X509_NAME *x509_armonk_locality_fixup(const X509_NAME *name)
 					 PV_IBM_Z_SUBJECT_LOCALITY_NAME_ARMONK))
 		return NULL;
 
-	ret = X509_NAME_dup(name);
+	ret = X509_NAME_dup((X509_NAME *)name);
 	if (!ret)
 		g_abort();