Preliminary support for M1 builds

NOTE: I don't have an M1 box right now, so I can only test with a
non-`/usr/local` _Intel_ Homebrew install. This takes care of the
"`cc` shim forbids `/usr/local` paths unless `HOMEBREW_PREFIX` is
the same", but there may be other M1-specific issues.

lib/fuse-pkg-config

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+fuse_root=%FUSE_ROOT%
+
+# Collect args
+pkgs=()
+flags=()
+
+for a in "$@"; do
+  [[ $a == -* ]] && flags+=("$a") || pkgs+=("$a")
+done
+
+if [[ ${#pkgs[@]} -eq 0 ]]; then
+  pkg-config "${flags[@]}"
+else
+  for p in "${pkgs[@]}"; do
+    if [[ $p == fuse ]]; then
+      pkg-config "${flags[@]}" "$p" | sed "s@/usr/local@${fuse_root}@g"
+    else
+      pkg-config "${flags[@]}" "$p"
+    fi
+  done
+fi