Add contrib/refresh_bb_tarballs.sh to aid in batch-grabbing BB hashes

contrib/refresh_bb_tarballs.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# Get this list via:
+#    using BinaryBuilder
+#    print("TRIPLETS=\"$(join(triplet.(BinaryBuilder.supported_platforms()), " "))\"")
+TRIPLETS="i686-linux-gnu x86_64-linux-gnu aarch64-linux-gnu arm-linux-gnueabihf powerpc64le-linux-gnu i686-linux-musl x86_64-linux-musl aarch64-linux-musl arm-linux-musleabihf x86_64-apple-darwin14 x86_64-unknown-freebsd11.1 i686-w64-mingw32 x86_64-w64-mingw32"
+
+# These are the projects currently using BinaryBuilder:
+BB_PROJECTS="llvm openblas"
+
+# Get "contrib/" directory path
+CONTRIB_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+
+# For each triplet and each project, download the BB tarball and save its hash:
+for triplet in $TRIPLETS; do
+	for proj in $BB_PROJECTS; do
+		PROJ="$(echo ${proj} | tr [a-z] [A-Z])"
+		make -C "$CONTRIB_DIR/../deps" USE_BINARYBUILDER_${PROJ}=1 ${PROJ}_BB_TRIPLET=${triplet} get-${proj}
+	done
+done