Prebuild libappimageupdate

.gitignore

@@ -2,3 +2,4 @@
 build_*/
 lib/qtlib/
 lib/AppImageUpdate/
+lib/AppImageUpdate-prebuilt/

scripts/build-docker.sh

@@ -37,6 +37,7 @@ build_appimage() {
     # docker-image: ubuntu:17.10
     apt update -qq
     apt -y install build-essential qt5-default libqt5websockets5-dev
+    apt -y install cmake libcurl4-gnutls-dev libxpm-dev
     apt -y install libssl1.0.0 zlib1g
     apt -y install git
     apt -y install curl

scripts/import.sh

@@ -10,3 +10,10 @@ if [ ! -d "${PROJDIR}/lib/AppImageUpdate" ]; then
     git clone https://github.com/AppImage/AppImageUpdate.git -b continuous --single-branch --depth=1 "${PROJDIR}/lib/AppImageUpdate"
     git -C "${PROJDIR}/lib/AppImageUpdate" submodule update --init --recursive --depth=1
 fi
+
+if [ ! -d "${PROJDIR}/lib/AppImageUpdate-prebuilt" ]; then
+    mkdir "${PROJDIR}/lib/AppImageUpdate-prebuilt"
+    cd "${PROJDIR}/lib/AppImageUpdate-prebuilt"
+    cmake "${PROJDIR}/lib/AppImageUpdate" -DUSE_SYSTEM_CURL=OFF -DBUILD_CPR_TESTS=OFF -DCMAKE_BUILD_TYPE=RelWithDebInfo
+    make libappimageupdate
+fi