Stratosphere: Add libnx fsp-ldr wrapper to Loader

stratosphere/loader/source/lib/fsldr.h

@@ -0,0 +1,17 @@
+/**
+ * @file fsldr.h
+ * @brief FilesystemProxy-ForLoader (fsp-ldr) service IPC wrapper.
+ * @author SciresM
+ * @copyright libnx Authors
+ */
+#pragma once
+#include <switch/types.h>
+#include <switch/services/sm.h>
+#include <switch/services/fs.h>
+
+Result fsldrInitialize(void);
+void fsldrExit(void);
+
+Result fsldrOpenCodeFileSystem(u64 tid, const char *path, FsFileSystem* out);
+Result fsldrIsArchivedProgram(u64 pid, bool *out);
+Result fsldrSetCurrentProcess();