Setup AL bootstrapping with Corretto 20.

This should not get upstreamed or merged to develop.

installers/linux/al2/spec/java-amazon-corretto.spec.template

@@ -142,9 +142,9 @@ BuildRequires: libXtst-devel
 BuildRequires: pkgconfig
 BuildRequires: xorg-x11-proto-devel
 
-%if %{with bootjdk}
-BuildRequires: java-${boot_jdk_major_version}-devel
-%endif
+#%if %{with bootjdk}
+#BuildRequires: java-${boot_jdk_major_version}-devel
+#%endif
 
 Requires: libX11
 Requires: libXi
@@ -247,13 +247,27 @@ Amazon Corretto's packaging of the OpenJDK ${java_spec_version} jmods.
 
 %build
 
+# Bootstrap with Corretto 20
+%ifarch aarch64
+curl -L -o corretto.tar.gz https://corretto.aws/downloads/latest/amazon-corretto-20-aarch64-linux-jdk.tar.gz
+echo "505409e4f7e7c6c9aeae61af6a7df075298ceed70b1b562dc6d5f65588e12b1e  corretto.tar.gz" > corretto.tar.gz.sha256
+%else
+curl -L -o corretto.tar.gz https://corretto.aws/downloads/latest/amazon-corretto-20-x64-linux-jdk.tar.gz
+echo "32a6ce43ec641b0bd55d21bc4aa17995407581fb1c5142703805960aea95d2db  corretto.tar.gz" > corretto.tar.gz.sha256
+%endif
+sha256sum -c corretto.tar.gz.sha256
+mkdir -p corretto-bootstrap-jdk
+tar -xf corretto.tar.gz --strip-component=1 -C corretto-bootstrap-jdk
+
+
 %if "%{dist}" == ".amzn2" || "%{dist}" == ".amzn2int"
 # AmazonLinux ships with GifLib 4.x which does not define GIFLIB_MAJOR. This must be defined
 # because -Werror=undef is enabled.
 %define GIFLIB_DEFINE "-DGIFLIB_MAJOR=4"
 %endif
 
 bash ./configure \\
+       --with-boot-jdk=\${PWD}/corretto-bootstrap-jdk \\
 %ifarch aarch64
         --with-extra-cflags="-moutline-atomics%{?GIFLIB_DEFINE: %{GIFLIB_DEFINE}}" \\
         --with-extra-cxxflags="-moutline-atomics" \\