nghttp2: Drop unused configuration value from build within CMake

Since commit 7ce2a682a3 (nghttp2 2022-09-21 (87fef4ab), 2022-09-21,
v3.26.0-rc1~455^2~1^2) we do not need `SIZEOF_INT_P`.

Utilities/cmnghttp2/cmakeconfig.h.in

@@ -8,9 +8,6 @@
 /* Define to `int' if <sys/types.h> does not define. */
 #cmakedefine ssize_t @ssize_t@
 
-/* sizeof(int *) */
-#define SIZEOF_INT_P KWIML_ABI_SIZEOF_DATA_PTR
-
 /* Define to 1 if you have the <arpa/inet.h> header file. */
 #cmakedefine HAVE_ARPA_INET_H 1