ci: add . to LD_LIBRARY_PATH

Author: sbinet

.travis.yml

@@ -22,6 +22,8 @@ before_install:
    - export GOTRACEBACK=crash
    # make python output (sys.stdout, sys.stderr) unbuffered
    - export PYTHONUNBUFFERED=1
+   # ls needs to look into the current directory to load the _go.so library
+   - export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:.
    # pypy3 isn't packaged in ubuntu yet.
    - TEMPDIR=$(mktemp -d)
    - export PYPYVERSION=v7.1.1