.travis.yml: increase timeout for test-all

we reached 30min timeout on osx build
https://travis-ci.org/ruby/ruby/jobs/473019623

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66619 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

.travis.yml

@@ -370,7 +370,7 @@ before_script:
 
 script:
   - $SETARCH make -s test TESTOPTS="${TESTOPTS=$JOBS -q --tty=no}"
-  - travis_wait 30 $SETARCH make -s test-all -o exts TESTOPTS="${TEST_ALL_OPTS=$TESTOPTS}"
+  - travis_wait 40 $SETARCH make -s test-all -o exts TESTOPTS="${TEST_ALL_OPTS=$TESTOPTS}"
   - $SETARCH make -s test-spec MSPECOPT=-ff # not using `-j` because sometimes `mspec -j` silently dies
 
 # Branch matrix.  Not all branches are Travis-ready so we limit branches here.