Change SIZEOF_BOOL to 1 for Windows.

For some reason it was previously defined as 0, which is silly.  The only
effect was to disable use of <stdbool.h>, which commit b2328bf6 intended
to make possible.

Thomas Munro

Discussion: https://postgr.es/m/CAEepm%3D3%3DTDYEXUEcHpEx%2BTwc31wo7PA0oBAiNt6sWmq93MW02A%40mail.gmail.com

src/include/pg_config.h.win32

@@ -615,7 +615,7 @@
 #define PG_VERSION_STR "Uninitialized version string (win32)"
 
 /* The size of `bool', as computed by sizeof. */
-#define SIZEOF_BOOL 0
+#define SIZEOF_BOOL 1
 
 /* The size of `long', as computed by sizeof. */
 #define SIZEOF_LONG 4