[travis] Comment out gobject-introspection again

Apparently the version on Travis is 1.32.0, while we require 1.34.0.
diff --git a/.travis.yml b/.travis.yml
index cebabef..c491189 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,11 +15,11 @@
   - sudo apt-get install libcairo2-dev # for utils
   - sudo apt-get install libicu-dev # for extra unicode functions
   - sudo apt-get install libgraphite2-dev # for extra shapers
-  - sudo apt-get install libgirepository1.0-dev # for gobject-introspection
+  - : #sudo apt-get install libgirepository1.0-dev # for gobject-introspection
   - sudo pip install cpp-coveralls # for coveralls.io code coverage tracking
 script:
   - NOCONFIGURE=1 ./autogen.sh
-  - ./configure --with-freetype --with-glib --with-gobject --with-cairo --with-icu --with-graphite2 --enable-introspection
+  - ./configure --with-freetype --with-glib --with-gobject --with-cairo --with-icu --with-graphite2
   - make && make check && { rm -f src/.libs/NONE.gcov; touch src/NONE; test $CC != gcc || coveralls; }
 notifications:
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