[libc] add __stack_chk_guard to generic (#121121)

Author: RossComputerGuy

libc/src/compiler/generic/__stack_chk_fail.cpp

@@ -12,6 +12,8 @@
 
 extern "C" {
 
+uintptr_t __stack_chk_guard = static_cast<uintptr_t>(0xa9fff01234);
+
 void __stack_chk_fail(void) {
   LIBC_NAMESPACE::write_to_stderr("stack smashing detected\n");
   LIBC_NAMESPACE::abort();