Ensure reproducible automake results.

scripts/reconfigure

@@ -40,6 +40,9 @@
 #
 set -e
 
+# this should guarantee reproducible results from automake runs
+export PERL_HASH_SEED=0
+
 case $(uname -s) in
   Darwin)
     libtoolize=glibtoolize

scripts/release/make-release

@@ -50,6 +50,10 @@ errMsg()
          "${BASH_SOURCE[-2]}" "${BASH_LINENO[-2]}" >&2
 }
 trap errMsg ERR
+
+# this should guarantee reproducible results from automake runs
+export PERL_HASH_SEED=0
+
 # check that generated files and scripts are in place
 if [[ -r configure && -r scripts/release/make-release-commit ]]; then
   # 1. import common script settings