build: upgrade system packages before building psycopg-binary

See #262

diff --git a/tools/build/wheel_linux_before_all.sh b/tools/build/wheel_linux_before_all.sh
index 45164cc0c1dea47806ea59953afb2e2787bb975a..fe29e41220993025eec6bab131d9dbcf6cf688d5 100755 (executable)
--- a/tools/build/wheel_linux_before_all.sh
+++ b/tools/build/wheel_linux_before_all.sh
@@ -29,6 +29,7 @@ case "$ID" in
                 > /etc/apt/trusted.gpg.d/postgresql.asc
         fi
         apt-get update
+        apt-get -y upgrade
         apt-get -y install libpq-dev
         ;;