Add NetBSD support in interception.h

[krytarowski]

Summary

Part of the code inspired by the original work on libsanitizer in GCC 5.4 by Christos Zoulas.

Sponsored by <The NetBSD Foundation>

lib/interception/interception.h

 //
 // Machinery for providing replacements/wrappers for system functions.
 //===----------------------------------------------------------------------===//
 
 #ifndef INTERCEPTION_H
 #define INTERCEPTION_H
 
 #if !defined(__linux__) && !defined(__FreeBSD__) && !defined(__APPLE__) && \
-    !defined(_WIN32) && !defined(__Fuchsia__)
+    !defined(__NetBSD__) && !defined(_WIN32) && !defined(__Fuchsia__)
 # error "Interception doesn't work on this operating system."
 #endif
 
 #include "sanitizer_common/sanitizer_internal_defs.h"
 
 // These typedefs should be used only in the interceptor definitions to replace
 // the standard system types (e.g. SSIZE_T instead of ssize_t)
 typedef __sanitizer::uptr    SIZE_T;

 #elif defined(_WIN32)
 # define WRAP(x) __asan_wrap_##x
 # define WRAPPER_NAME(x) "__asan_wrap_"#x
 # define INTERCEPTOR_ATTRIBUTE __declspec(dllexport)
 # define DECLARE_WRAPPER(ret_type, func, ...) \
     extern "C" ret_type func(__VA_ARGS__);
 # define DECLARE_WRAPPER_WINAPI(ret_type, func, ...) \
     extern "C" __declspec(dllimport) ret_type __stdcall func(__VA_ARGS__);
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__NetBSD__)
 # define WRAP(x) __interceptor_ ## x
 # define WRAPPER_NAME(x) "__interceptor_" #x
 # define INTERCEPTOR_ATTRIBUTE __attribute__((visibility("default")))
 // FreeBSD's dynamic linker (incompliantly) gives non-weak symbols higher
 // priority than weak ones so weak aliases won't work for indirect calls
 // in position-independent (-fPIC / -fPIE) mode.
 # define DECLARE_WRAPPER(ret_type, func, ...) \
      extern "C" ret_type func(__VA_ARGS__) \

 typedef unsigned long long uptr;  // NOLINT
 #else
 typedef unsigned long uptr;  // NOLINT
 #endif  // _WIN64
 }  // namespace __interception
 
 #define INCLUDED_FROM_INTERCEPTION_LIB
 
-#if defined(__linux__) || defined(__FreeBSD__)
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__)
 # include "interception_linux.h"
 # define INTERCEPT_FUNCTION(func) INTERCEPT_FUNCTION_LINUX_OR_FREEBSD(func)
 # define INTERCEPT_FUNCTION_VER(func, symver) \
     INTERCEPT_FUNCTION_VER_LINUX_OR_FREEBSD(func, symver)
 #elif defined(__APPLE__)
 # include "interception_mac.h"
 # define INTERCEPT_FUNCTION(func) INTERCEPT_FUNCTION_MAC(func)
 # define INTERCEPT_FUNCTION_VER(func, symver) \