Update Flatpak to OpenJDK11

see <https://github.com/flathub/org.libreoffice.LibreOffice/issues/57>
"OpenJDK 11 is available".

Change-Id: Ie24ed7349ca9a4a57c1a8d18d10b29c4a37e259c
Reviewed-on: https://gerrit.libreoffice.org/65830
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

distro-configs/LibreOfficeFlatpak.conf

@@ -4,7 +4,7 @@
 --with-ant-home=/run/build/libreoffice/ant
 --with-extra-buildid=Flatpak
 --with-help=html
---with-jdk-home=/usr/lib/sdk/openjdk10/jvm/openjdk-10
+--with-jdk-home=/usr/lib/sdk/openjdk11/jvm/openjdk-11
 --with-lang=ALL
 --with-system-libs
 --with-vendor=The Document Foundation

solenv/flatpak-manifest.in

@@ -4,7 +4,7 @@
     "runtime-version": "18.08",
     "sdk": "org.freedesktop.Sdk",
     "sdk-extensions": [
-        "org.freedesktop.Sdk.Extension.openjdk10"
+        "org.freedesktop.Sdk.Extension.openjdk11"
     ],
     "command": "/app/libreoffice/program/soffice",
     "modules": [
@@ -12,7 +12,7 @@
             "name": "openjdk",
             "buildsystem": "simple",
             "build-commands": [
-                "/usr/lib/sdk/openjdk10/install.sh"
+                "/usr/lib/sdk/openjdk11/install.sh"
             ]
         },
         {