[Travis] Correct call to custom_build

.travis.yml

@@ -19,7 +19,7 @@ only:
 matrix:
 allow_failures:
 - compiler: clang
-script: ./.travis/run custom_build
-after_success: ./.travis/run after_success
+script: ./.travis/run ./travis_custom/custom_build
+after_success: ./travis/run after_success
 after_failure: ./.travis/run after_failure
 before_install: ./travis_custom/custom_before_install
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