autotools: Fix compatibility with POSIX shell

src/buildstream_plugins/elements/autotools.yaml

@@ -79,17 +79,17 @@ variables:
   remove-libtool-libraries: "false"
 
   delete-libtool-archives: |
-    if %{remove-libtool-modules} || %{remove-libtool-libraries}; then
-      find "%{install-root}" -name "*.la" -print0 | while read -d '' -r file; do
-        if grep '^shouldnotlink=yes$' "${file}" &>/dev/null; then
-          if %{remove-libtool-modules}; then
+    if [ "%{remove-libtool-modules}" = "true" ] || [ "%{remove-libtool-libraries}" = "true" ]; then
+      find "%{install-root}" -name "*.la" | while IFS= read -r file; do
+        if grep '^shouldnotlink=yes$' "${file}" >/dev/null 2>&1; then
+          if [ "%{remove-libtool-modules}" = "true" ]; then
             echo "Removing ${file}."
             rm "${file}"
           else
             echo "Not removing ${file}."
           fi
         else
-          if %{remove-libtool-libraries}; then
+          if [ "%{remove-libtool-libraries}" = "true" ]; then
             echo "Removing ${file}."
             rm "${file}"
           else

tests/cachekey/project/elements/autotools1.expected

@@ -1 +1 @@
-98ae7c344c01c64d2597338ec632e22a36f1b78ce502a9f3ed668edd0921dcb3
+1f566532b409f730be288e6138439236d65330c98269fc5956b12e02295c433b

tests/cachekey/project/target.expected

@@ -1 +1 @@
-3dc2ed8ab56f9c706e1fbf4bacc1ab1e38d20f66c686f1ab05d5ad0e504272fc
+9219dea2e49b451bbd2f8f8797ac43a31b957b51919171a3449e4d8870d2bc62