Fix PathIsAbsolute function not dealing with CYGWIN. Handle absolute paths in logfile api.

src/util-logopenfile.c

@@ -132,7 +132,11 @@ SCConfLogOpenGeneric(ConfNode *conf,
     if (ConfGet("default-log-dir", &log_dir) != 1)
         log_dir = DEFAULT_LOG_DIR;
 
+    if (PathIsAbsolute(filename)) {
+        snprintf(log_path, PATH_MAX, "%s", filename);
+    } else {
         snprintf(log_path, PATH_MAX, "%s/%s", log_dir, filename);
+    }
 
     filetype = ConfNodeLookupChildValue(conf, "filetype");
     if (filetype == NULL)

src/util-path.c

@@ -40,7 +40,7 @@ int PathIsAbsolute(const char *path) {
         return 1;
     }
 
-#ifdef OS_WIN32
+#if (defined OS_WIN32 || defined __CYGWIN__)
     if (strlen(path) > 2) {
         if (isalpha(path[0]) && path[1] == ':') {
             return 1;