For some reason it was previously defined as 0, which is silly. The only
effect was to disable use of <stdbool.h>, which commit
b2328bf62 intended
to make possible.
Thomas Munro
Discussion: https://postgr.es/m/CAEepm%3D3%3DTDYEXUEcHpEx%2BTwc31wo7PA0oBAiNt6sWmq93MW02A%40mail.gmail.com
#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