patch 8.2.3515: nano time test fails on Mac and FreeBSD

Problem:    Nano time test fails on Mac and FreeBSD.
Solution:   Also check nano time when not on Linux. (Ozaki Kiichi,
            closes #9000)
diff --git a/src/fileio.c b/src/fileio.c
index 63d083e..2f3dc39 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3121,18 +3121,19 @@
     int
 time_differs(stat_T *st, long mtime, long mtime_ns UNUSED)
 {
-#if defined(__linux__) || defined(MSWIN)
-    // On a FAT filesystem, esp. under Linux, there are only 5 bits to store
-    // the seconds.  Since the roundoff is done when flushing the inode, the
-    // time may change unexpectedly by one second!!!
-    return (long)st->st_mtime - mtime > 1 || mtime - (long)st->st_mtime > 1
-# ifdef ST_MTIM_NSEC
-		|| (long)st->ST_MTIM_NSEC != mtime_ns
-# endif
-		;
-#else
-    return (long)st->st_mtime != mtime;
+    return
+#ifdef ST_MTIM_NSEC
+	(long)st->ST_MTIM_NSEC != mtime_ns ||
 #endif
+#if defined(__linux__) || defined(MSWIN)
+	// On a FAT filesystem, esp. under Linux, there are only 5 bits to store
+	// the seconds.  Since the roundoff is done when flushing the inode, the
+	// time may change unexpectedly by one second!!!
+	(long)st->st_mtime - mtime > 1 || mtime - (long)st->st_mtime > 1
+#else
+	(long)st->st_mtime != mtime
+#endif
+	;
 }
 
 /*
diff --git a/src/version.c b/src/version.c
index f7ebc70..f7af2d7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3515,
+/**/
     3514,
 /**/
     3513,