Make sign-developer-id work if Sparkle is disabled

Currently it Sparkle is disabled we remove it from the bundle. Make code
signing resilient to that. This isn't used in our CI, but useful for
testing or if some other people want to bundle MacVim without Sparkle.

src/MacVim/scripts/sign-developer-id

@@ -35,8 +35,11 @@ else
         codesign -f -s "Developer ID Application" -o runtime --timestamp "$macvim_path/Contents/Frameworks/Sparkle.framework/Versions/B/Autoupdate"
         codesign -f -s "Developer ID Application" -o runtime --timestamp "$macvim_path/Contents/Frameworks/Sparkle.framework/Versions/B/Updater.app")
     fi
+    if [ -d $macvim_path/Contents/Frameworks/Sparkle.framework ]; then
+        (set -x
+        codesign -f -s "Developer ID Application" -o runtime --timestamp "$macvim_path/Contents/Frameworks/Sparkle.framework")
+    fi
     set -x
-    codesign -f -s "Developer ID Application" -o runtime --timestamp "$macvim_path/Contents/Frameworks/Sparkle.framework"
     codesign -f -s "Developer ID Application" -o runtime --timestamp "$macvim_path/Contents/Frameworks/PSMTabBarControl.framework"
     codesign -f -s "Developer ID Application" -o runtime --timestamp "$macvim_path/Contents/Library/QuickLook/QLStephen.qlgenerator/Contents/MacOS/QLStephen"
     codesign -f -s "Developer ID Application" -o runtime --timestamp --entitlements $entitlements "$macvim_path/Contents/MacOS/Vim"