scripts: Add missing system dependencies

apploader needs libssl-dev

Bug: None
Change-Id: Ie0c14ec27acc90cb08d0e20ee1f2f1bc0b8dac7f
diff --git a/scripts/check_system_dependencies.sh b/scripts/check_system_dependencies.sh
index cd155f8..cb0a0ad 100755
--- a/scripts/check_system_dependencies.sh
+++ b/scripts/check_system_dependencies.sh
@@ -3,7 +3,7 @@
 set -e
 set -u
 
-DEPS=(libpixman-1-dev libstdc++-8-dev pkg-config libglib2.0-dev libusb-1.0-0-dev)
+DEPS=(libpixman-1-dev libstdc++-8-dev pkg-config libglib2.0-dev libusb-1.0-0-dev libssl-dev)
 
 if dpkg -V ${DEPS[@]}; then
   echo "System dependencies appear to be installed."