[Travis] Increase travis_wait time

.travis.yml

@@ -38,7 +38,7 @@ install:
 script:
   - export CMAKE_ADDITIONAL_OPTIONS="-DCMAKE_BUILD_TYPE=${BUILDTYPE}"
   - sudo free -m -t
-  - travis_wait 30 ./.travis/run ../travis_custom/custom_build
+  - travis_wait 40 ./.travis/run ../travis_custom/custom_build
 after_failure: ./.travis/run after_failure
 after_success:
   - ./.travis/run after_success