refs #5206 get file.c compiling on lex2

git-svn-id: file:///svn/toku/tokudb@45910 c7de825b-a66e-492c-adef-691d508d4ae1

portability/file.cc

@@ -454,7 +454,7 @@ toku_fsync_directory(const char *fname) {
     int result = 0;
     
     // extract dirname from fname
-    char *sp = strrchr(fname, '/');
+    const char *sp = strrchr(fname, '/');
     size_t len;
     char *dirname = NULL;
     if (sp) {