base: Remove use of mallinfo for Musl

src/base/trace_event/malloc_dump_provider.cc

@@ -358,6 +358,7 @@ bool MallocDumpProvider::OnMemoryDump(const MemoryDumpArgs& args,
                      &allocated_objects_count);
 #elif BUILDFLAG(IS_FUCHSIA)
 // TODO(fuchsia): Port, see https://crbug.com/706592.
+#elif defined(__MUSL__)
 #else
   ReportMallinfoStats(/*pmd=*/nullptr, &total_virtual_size, &resident_size,
                       &allocated_objects_size, &allocated_objects_count);