emacs-26 bootstrap failure on Windows

[Andy Moreton]

Bootstrapping on Windows with 64bit mingw-w64 failed today, as the
dump_heap array needs expanding again:

diff --git a/src/w32heap.c b/src/w32heap.c
index a3f87bfc7e..df79f8c2ce 100644
--- a/src/w32heap.c
+++ b/src/w32heap.c
@@ -116,7 +116,7 @@ typedef struct _RTL_HEAP_PARAMETERS {
    to build only the first bootstrap-emacs.exe with the large size,
    and reset that to a lower value afterwards.  */
 #if defined _WIN64 || defined WIDE_EMACS_INT
-# define DUMPED_HEAP_SIZE (22*1024*1024)
+# define DUMPED_HEAP_SIZE (23*1024*1024)
 #else
 # define DUMPED_HEAP_SIZE (13*1024*1024)
 #endif