gcsfuse: depend on linux

Formula/gcsfuse.rb

@@ -11,14 +11,8 @@ class Gcsfuse < Formula
   end
 
   depends_on "go" => :build
-
-  on_macos do
-    disable! date: "2021-04-08", because: "requires closed-source macFUSE"
-  end
-
-  on_linux do
-    depends_on "libfuse"
-  end
+  depends_on "libfuse"
+  depends_on :linux # on macOS, requires closed-source macFUSE
 
   def install
     # Build the build_gcsfuse tool. Ensure that it doesn't pick up any
@@ -31,25 +25,8 @@ class Gcsfuse < Formula
     system "./build_gcsfuse", buildpath, prefix, gcsfuse_version
   end
 
-  def caveats
-    on_macos do
-      <<~EOS
-        The reasons for disabling this formula can be found here:
-          https://github.com/Homebrew/homebrew-core/pull/64491
-
-        An external tap may provide a replacement formula. See:
-          https://docs.brew.sh/Interesting-Taps-and-Forks
-      EOS
-    end
-  end
-
   test do
     system "#{bin}/gcsfuse", "--help"
-    separator = if OS.mac?
-      "_"
-    else
-      "."
-    end
-    system "#{sbin}/mount#{separator}gcsfuse", "--help"
+    system "#{sbin}/mount.gcsfuse", "--help"
   end
 end