New review comment by Johnnynator on void-packages repository

https://github.com/void-linux/void-packages/pull/25651#discussion_r507119632

Comment:
No need to escape a newline in a quoted string. Also don't hard disable tests. add smth like
```
if [ "$XBPS_CHECK_PKGS" ]; then
        configure_args+=" -DBUILD_TESTS=ON"
else
        configure_args+=" -DBUILD_TESTS=OFF"
fi
```
after checksum and

```
do_check() {
        cd build
        # BlockTests requires llvm, we don't build it with llvm
        ctest -E 'BlockTests'
}

post_install() {
        [ -d "${DESTDIR}/usr/share/test/SeExpr2" ] && rm -r "${DESTDIR}/usr/share/test/SeExpr2" || true
}
```
 after pre_configure