Do not tail the distcheck output

From Travis logs:
No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.

Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received

.travis.yml

@@ -10,8 +10,7 @@ script:
     - ./configure --enable-Werror --enable-code-coverage
     - make -j8
     - make check
-    - set -o pipefail
-    - make distcheck 2>&1 | tail -10000
+    - make distcheck
 after_success:
   - test "x$CC" = "xgcc" -o "x$CC" = "xclang" && make code-coverage-capture && coveralls-lcov asn1c-*-coverage.info
 after_failure: