Update Linux updater for Zotero 7

.gitattributes

@@ -2,3 +2,4 @@
 app/win/zotero.exe.tar.xz filter=lfs diff=lfs merge=lfs -text
 app/mac/updater.tar.xz filter=lfs diff=lfs merge=lfs -text
 app/win/updater.exe.tar.xz filter=lfs diff=lfs merge=lfs -text
+app/linux/updater.tar.xz filter=lfs diff=lfs merge=lfs -text

app/build.sh

@@ -855,7 +855,8 @@ if [ $BUILD_LINUX == 1 ]; then
 		cp "$CALLDIR/linux/set_launcher_icon" "$APPDIR"
 		
 		# Use our own updater, because Mozilla's requires updates signed by Mozilla
-		cp "$CALLDIR/linux/updater-$arch" "$APPDIR"/updater
+		tar xf "$CALLDIR/linux/updater.tar.xz" --to-stdout updater-$arch > "$APPDIR/updater"
+		chmod 755 "$APPDIR/updater"
 
 		# Copy app files
 		rsync -a "$base_dir/" "$APPDIR/"

app/linux/mozconfig

@@ -0,0 +1,27 @@
+# Uncomment to build 32-bit
+#ac_add_options --target=i686
+
+ac_add_options --enable-bootstrap
+
+mk_add_options AUTOCLOBBER=1
+
+# These don't all affect the stub, but they can't hurt, and we'll want them if
+# we switch to custom XUL builds
+ac_add_options MOZ_ENABLE_JS_DUMP=1
+ac_add_options MOZ_ENABLE_FORKSERVER=
+ac_add_options MOZ_TELEMETRY_REPORTING=
+ac_add_options MOZ_DATA_REPORTING=
+ac_add_options --disable-tests
+ac_add_options --disable-debug
+ac_add_options --disable-debug-symbols
+ac_add_options --disable-webrtc
+ac_add_options --disable-eme
+
+export MOZILLA_OFFICIAL=1
+export RELEASE_OR_BETA=1
+MOZ_REQUIRE_SIGNING=
+
+ac_add_options --enable-official-branding
+
+# Build updater without MAR signature verification
+ac_add_options --disable-verify-mar