Add the 'restrict' qualifier to match the 'gettimeofday' declaration found
in glibc 2.31.

--- datefudge-1.23/datefudge.c	2020-02-17 22:35:21.343341725 +0100
+++ datefudge-1.23/datefudge.c	2020-02-17 22:35:49.619117874 +0100
@@ -78,6 +78,6 @@
     return 0;
 }
 
-int gettimeofday(struct timeval *x, struct timezone *y) {
+int gettimeofday(struct timeval *restrict x, void *restrict y) {
     return __gettimeofday(x,y);
 }