contrib: update tarball script

contrib/ci.inria.fr/job-0-tarball.sh

@@ -1,8 +1,12 @@
 #!/bin/sh
 
+export PKG_CONFIG_PATH=/home/ci/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH
+export LD_LIBRARY_PATH=/home/ci/usr/local/lib:$LD_LIBRARY_PATH
+
 ./autogen.sh
 mkdir build && cd build
 ../configure
-make
-make distcheck
+make V=1
+make dist
+make clean