Sort package manifests under LC_ALL=C

pkg-snapshot and dots used plain sort, which is locale-dependent: the same
package set ordered differently on two machines, so dots reported drift
that did not exist. A maintenance tool that always cries wolf is the exact
failure mode dots exists to avoid.

common/bin/pkg-snapshot

@@ -9,11 +9,11 @@ OUT="${REPO}/packages"
 mkdir -p "$OUT"
 
 if command -v pacman >/dev/null 2>&1; then
-  pacman -Qqen | sort > "${OUT}/${HOST}.pacman"
-  pacman -Qqem | sort > "${OUT}/${HOST}.aur"
+  pacman -Qqen | LC_ALL=C sort > "${OUT}/${HOST}.pacman"
+  pacman -Qqem | LC_ALL=C sort > "${OUT}/${HOST}.aur"
   echo "wrote ${HOST}.pacman ($(wc -l < "${OUT}/${HOST}.pacman")) and ${HOST}.aur ($(wc -l < "${OUT}/${HOST}.aur"))"
 elif command -v apt-mark >/dev/null 2>&1; then
-  apt-mark showmanual | sort > "${OUT}/${HOST}.apt"
+  apt-mark showmanual | LC_ALL=C sort > "${OUT}/${HOST}.apt"
   echo "wrote ${HOST}.apt ($(wc -l < "${OUT}/${HOST}.apt"))"
 else
   echo "pkg-snapshot: no pacman or apt-mark on this machine" >&2; exit 1