contrib: add "set -e" to bash scripts where missing

contrib/build-wine/sign.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 here=$(dirname "$0")
 if [ -z "$WIN_SIGNING_PASSWORD" ]; then
     echo "password missing"

contrib/build_tools_util.sh

@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 # Set a fixed umask as this leaks into docker containers
 umask 0022
 

contrib/generate_payreqpb2.sh

@@ -1,6 +1,8 @@
 #!/bin/bash
 # Generates the file paymentrequest_pb2.py
 
+set -e
+
 CONTRIB="$(dirname "$(readlink -e "$0")")"
 EL="$CONTRIB"/../electrum
 

contrib/osx/notarize_app.sh

@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 # from https://github.com/metabrainz/picard/blob/e1354632d2db305b7a7624282701d34d73afa225/scripts/package/macos-notarize-app.sh
 
+set -e
 
 if [ -z "$1" ]; then
     echo "Specify app bundle as first parameter"