✨ Simulator HAL and build targets (#22418)

Marlin/src/sd/SdFatUtil.cpp

@@ -48,7 +48,7 @@
     return &top - reinterpret_cast<char*>(sbrk(0));
   }
 
-#else
+#elif defined(__AVR__)
 
   extern char* __brkval;
   extern char __bss_end;

Marlin/src/sd/cardreader.cpp

@@ -939,7 +939,7 @@ const char* CardReader::diveToFile(const bool update_cwd, SdFile* &inDirPtr, con
 
   while (atom_ptr) {
     // Find next subdirectory delimiter
-    char * const name_end = strchr(atom_ptr, '/');
+    const char * const name_end = strchr(atom_ptr, '/');
 
     // Last atom in the path? Item found.
     if (name_end <= atom_ptr) break;