shmget() with IPC_CREAT must not create 0 size SHM

The recently committed fix for GH-9944 did only indirectly cater to
that, namely because in this case `CreateFileMapping()` with a zero
size couldn't be created.  As of PHP 8.2.0, the mappings of the actual
SHM and the info segment have been merged, so creating a zero size SHM
would be possible unless we explicitly prohibit this.

Author: cmb69

TSRM/tsrm_win32.c

@@ -645,7 +645,7 @@ TSRM_API int shmget(key_t key, size_t size, int flags)
 
 	if (!shm_handle) {
 		if (flags & IPC_CREAT) {
-			if (size > SIZE_MAX - sizeof(shm->descriptor)) {
+			if (size == 0 || size > SIZE_MAX - sizeof(shm->descriptor)) {
 				return -1;
 			}
 			size += sizeof(shm->descriptor);