[scudo] Remove SANITIZER_LINUX requirement for the malloc interceptors

[cryptoad]

Summary

Currently all platforms are using the scudo_interceptors.cpp interceptors.

We might to come up with platform specific interceptors when/if we get Apple &
Windows, but as of now, that allows for Fuchsia to use them.

scudo_new_delete.cpp didn't have the #if SANITIZER_LINUX so it's good to go.

lib/scudo/scudo_interceptors.cpp

 //===-- scudo_interceptors.cpp ----------------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
-/// Linux specific malloc interception functions.
+/// Interceptors for malloc related functions.
 ///
 //===----------------------------------------------------------------------===//
 
-#include "sanitizer_common/sanitizer_platform.h"
-#if SANITIZER_LINUX
-
 #include "scudo_allocator.h"
 
 #include "interception/interception.h"
 
 using namespace __scudo;
 
 INTERCEPTOR(void, free, void *ptr) {
   scudoFree(ptr, FromMalloc);

 
 INTERCEPTOR(uptr, malloc_usable_size, void *ptr) {
   return scudoMallocUsableSize(ptr);
 }
 
 INTERCEPTOR(int, mallopt, int cmd, int value) {
   return -1;
 }
-
-#endif  // SANITIZER_LINUX