Force bash usage

The default shell on i386 stretch has some sort of problem with wildcard
expansion. Force usage of bash.

Change-Id: I923375128b7861ec5f7a2c2d77a50850f888035e

pkg/deb/backports/stretch

@@ -33,6 +33,7 @@ sname:=rtpengine\
 # Source version\
 sversion:=$(DEB_VERSION_UPSTREAM)\
 ## end of kernel package specific stuff\
+export SHELL=/bin/bash\
 ;' "${DIST}"/rules
 sed -i 's;^execute_before_dh_auto_install-indep:;execute_before_dh_auto_install-indep:\
 \t# Create the directories to install the source into\

utils/build_test_wrapper

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 TARGET=$1
 ROOT=$(echo "$TARGET" | sed 's/\.h$//')
 if test "x$MAKE" = x; then