[build] Always try to init/update submodules (#1692)

submodules can be outdated etc when switching between branches, it makes sense to just always re-init them

Signed-off-by: Harry Bond <me@hbond.xyz>
Co-authored-by: Harry Bond <me@hbond.xyz>
Co-committed-by: Harry Bond <me@hbond.xyz>

configure.sh

@@ -68,10 +68,10 @@ Diff() {
   fi
 }
 
-if [ ! -d 3party/boost/tools ]; then
-  echo "Cloning all submodules..."
-  git submodule update --init --recursive --depth 1
-fi
+
+echo "Checking submodules..."
+git submodule update --init --recursive --depth 1
+
 if [ ! -d 3party/boost/boost ]; then
   echo "Bootstrapping the boost C++ library..."
   pushd 3party/boost/