Some mmap(2) flags are Linux-specific but otherwise not required

core/os_interface/linux/os_memory_linux.cpp:17:83: error:
      use of undeclared identifier 'MAP_NORESERVE'
    return mmapWrapper(0, sizeToReserve, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_...
                                                                                  ^
core/os_interface/linux/os_memory_linux.cpp:17:99: error:
      use of undeclared identifier 'MAP_HUGETLB'
  ...mmapWrapper(0, sizeToReserve, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_HUGETLB, -1...
                                                                                            ^

--- shared/source/os_interface/linux/os_memory_linux.cpp.orig	2020-02-28 16:16:42 UTC
+++ shared/source/os_interface/linux/os_memory_linux.cpp
@@ -7,6 +7,17 @@
 
 #include "shared/source/os_interface/linux/os_memory_linux.h"
 
+#ifdef MAP_ALIGNED_SUPER
+#define MAP_HUGETLB MAP_ALIGNED_SUPER // FreeBSD
+#endif
+
+#ifndef MAP_NORESERVE
+#define MAP_NORESERVE 0
+#endif
+#ifndef MAP_HUGETLB
+#define MAP_HUGETLB 0
+#endif
+
 namespace NEO {
 
 std::unique_ptr<OSMemory> OSMemory::create() {