FIXME(44217) remove fixme because the allocator logic was removed, but platform specific code remains

Author: nivkner

src/tools/tidy/src/pal.rs

@@ -58,7 +58,7 @@ const EXCEPTION_PATHS: &[&str] = &[
     "src/rtstartup", // Not sure what to do about this. magic stuff for mingw
 
     // temporary exceptions
-    "src/libstd/lib.rs", // FIXME(#44217)
+    "src/libstd/lib.rs",
     "src/libstd/path.rs",
     "src/libstd/f32.rs",
     "src/libstd/f64.rs",