patch 8.2.2909: build error with non-Unix system

Problem:    Build error with non-Unix system.
Solution:   Always include limits.h.
diff --git a/src/vim.h b/src/vim.h
index 368cf32..515f8d5 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -46,9 +46,6 @@
 #  endif
 # endif
 
-// for INT_MAX, LONG_MAX et al.
-# include <limits.h>
-
 /*
  * Cygwin may have fchdir() in a newer release, but in most versions it
  * doesn't work well and avoiding it keeps the binary backward compatible.
@@ -62,6 +59,9 @@
 # define UINT32_TYPEDEF uint32_t
 #endif
 
+// for INT_MAX, LONG_MAX et al.
+#include <limits.h>
+
 #if !defined(UINT32_TYPEDEF)
 # if defined(uint32_t)  // this doesn't catch typedefs, unfortunately
 #  define UINT32_TYPEDEF uint32_t