Fix windows-unsafe unicode path usage in lsl syntax cache

Author: RyeMutt

indra/newview/llsyntaxid.cpp

@@ -521,7 +521,7 @@ std::vector<std::string> LLSyntaxDefCache::getCacheFileNames() const
 
 LLSD LLSyntaxDefCache::loadDeserializedCacheFile(const std::string& file_path)
 {
-    std::ifstream file(file_path.c_str());
+    llifstream file(file_path);
     if (file.good())
     {
         LLSD content;
@@ -542,7 +542,7 @@ std::string LLSyntaxDefCache::loadCacheFile(const std::string& name) const
     std::string full_path = mFileCachePaths.getPath(name);
     if (!full_path.empty())
     {
-        std::ifstream file(full_path.c_str());
+        llifstream file(full_path);
         if (file.good())
         {
             std::ostringstream ss;