kconfig/conf: print the seed used to initialise the RNG for randconfig

... so the user has a chance to reproduce a test-case.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

scripts/kconfig/conf.c

@@ -532,6 +532,7 @@ int main(int ac, char **av)
 					seed = tmp;
 				}
 			}
+			fprintf( stderr, "KCONFIG_SEED=0x%X\n", seed );
 			srand(seed);
 			break;
 		}