can now depend on libc having a getrandom wrapper

random.c

@@ -5,17 +5,7 @@
 #include "random.h"
 #include "util.h"
 
-#if __has_include(<sys/random.h>)
-// glibc 2.25 and later
 #include <sys/random.h>
-#else
-#include <unistd.h>
-#include <sys/syscall.h>
-
-static ssize_t getrandom(void *buf, size_t buflen, unsigned int flags) {
-    return syscall(SYS_getrandom, buf, buflen, flags);
-}
-#endif
 
 static void get_random_seed(void *buf, size_t size) {
     while (size) {