Travis does not terminate on error on non last command inside if construct

In case we have an `if` construct with multiple statements and the non last statement gives an error this is ignored by travis.
- In the mentioned case we can take the 2 statements (`make tests` and `make docs` together), so no construct with a script and `set -e` is required.
- due to a problem with the shared libraries in the case we compile with `clang` compiler and the `xmllint` program we need to exclude the `make tests` here as well.

Tests were don with the test pull request #7939

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