Bug 1365994 - Update libfuzzer r=decoder

MozReview-Commit-ID: GCwIIZd5PTS
***
1365994 - update moz.build for libfuzzer

MozReview-Commit-ID: IxbLnviJC08

tools/fuzzing/libfuzzer/FuzzerUtilLinux.cpp

@@ -1,4 +1,4 @@
-//===- FuzzerUtilLinux.cpp - Misc utils -----------------------------------===//
+//===- FuzzerUtilLinux.cpp - Misc utils for Linux. ------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -10,10 +10,15 @@
 //===----------------------------------------------------------------------===//
 #include "FuzzerDefs.h"
 #if LIBFUZZER_LINUX
+
 #include <stdlib.h>
+
 namespace fuzzer {
+
 int ExecuteCommand(const std::string &Command) {
   return system(Command.c_str());
 }
-}
+
+} // namespace fuzzer
+
 #endif // LIBFUZZER_LINUX