Add explicit qualification.

Calling a superclass method requires explicit qualification when the
superclass is a templated class.

src/pal/pal_bsd_aligned.h

@@ -45,7 +45,7 @@ namespace snmalloc
         0);
 
       if (p == MAP_FAILED)
-        error("Out of memory");
+        PALBSD<OS>::error("Out of memory");
 
       return p;
     }