Remove patch which isn't applied and in upstream JDK 11.

JDK-8201495-s390-java-opts.patch

@@ -1,21 +0,0 @@
-# HG changeset patch
-# User sgehwolf
-# Date 1523874036 -7200
-#      Mon Apr 16 12:20:36 2018 +0200
-# Node ID fc3a72e286e0d5bf9b994d1b778b39f3b080c686
-# Parent  69bae761600bdbc97953500ac51a396d31f54ee9
-8201495: [Zero] Reduce limits of max heap size for boot JDK on s390
-Reviewed-by: ihse, aph, simonis
-
-diff --git a/make/autoconf/boot-jdk.m4 b/make/autoconf/boot-jdk.m4
---- a/make/autoconf/boot-jdk.m4
-+++ b/make/autoconf/boot-jdk.m4
-@@ -405,7 +405,7 @@
-   BOOTCYCLE_JVM_ARGS_BIG=-Xms64M
- 
-   # Maximum amount of heap memory and stack size.
--  JVM_HEAP_LIMIT_32="1024"
-+  JVM_HEAP_LIMIT_32="768"
-   # Running a 64 bit JVM allows for and requires a bigger heap
-   JVM_HEAP_LIMIT_64="1600"
-   STACK_SIZE_32=768