tools: virt-host-validate: fix CPU flag detection

Let's fix CPU flag detection on s390, where the flags line begins with
a lower-case 'features'.
Signed-off-by: NBjoern Walk <bwalk@linux.vnet.ibm.com>

tools/virt-host-validate-common.c

@@ -212,10 +212,11 @@ virBitmapPtr virHostValidateGetCPUFlags(void)
         if (!fgets(line, sizeof(line), fp))
             break;
 
-        /* The line we're interested in is marked either as "flags" or
-         * as "Features" depending on the architecture, so check both
-         * prefixes */
-        if (!STRPREFIX(line, "flags") && !STRPREFIX(line, "Features"))
+        /* The line we're interested in is marked differently depending
+         * on the architecture, so check possible prefixes */
+        if (!STRPREFIX(line, "flags") &&
+            !STRPREFIX(line, "Features") &&
+            !STRPREFIX(line, "features"))
             continue;
 
         /* fgets() includes the trailing newline in the output buffer,