Remove mallopt to fix build on musl

Other sanitizers don't use mallopt, musl doesn't provide mallopt,
and tcmalloc ignores mallopt. Its easiest jut to remove it

Author: Daniel Martinez

compiler-rt/lib/nsan/nsan_interceptors.cpp

@@ -21,10 +21,6 @@
 
 #include <wchar.h>
 
-#if SANITIZER_LINUX
-extern "C" int mallopt(int param, int value);
-#endif
-
 using namespace __sanitizer;
 using __nsan::nsan_init_is_running;
 using __nsan::nsan_initialized;
@@ -209,12 +205,6 @@ void __nsan::InitializeInterceptors() {
   static bool initialized = false;
   CHECK(!initialized);
 
-  // Instruct libc malloc to consume less memory.
-#if SANITIZER_LINUX
-  mallopt(1, 0);          // M_MXFAST
-  mallopt(-3, 32 * 1024); // M_MMAP_THRESHOLD
-#endif
-
   InitializeMallocInterceptors();
 
   INTERCEPT_FUNCTION(memset);