xrCore/FileSystem: Mark static methods as static.

Author: Kaffeine

src/xrCore/FileSystem.h

@@ -35,10 +35,10 @@ class XRCORE_API EFS_Utils
     xr_string ChangeFileExt(LPCSTR src, LPCSTR ext);
     xr_string ChangeFileExt(const xr_string& src, LPCSTR ext);
 
-    xr_string ExtractFileName(LPCSTR src);
-    xr_string ExtractFilePath(LPCSTR src);
-    xr_string ExtractFileExt(LPCSTR src);
-    xr_string ExcludeBasePath(LPCSTR full_path, LPCSTR excl_path);
+    static xr_string ExtractFileName(LPCSTR src);
+    static xr_string ExtractFilePath(LPCSTR src);
+    static xr_string ExtractFileExt(LPCSTR src);
+    static xr_string ExcludeBasePath(LPCSTR full_path, LPCSTR excl_path);
 };
 extern XRCORE_API EFS_Utils* xr_EFS;
 #define EFS (*xr_EFS)