cmd/distpack: test for .DS_Store files in all directories

macOS may write a .DS_Store file to any directory at any time in
the general case, unfortunately. Expand test rules to catch them
no matter where they may appear.

For #24904.

Change-Id: I98a2bb5d0ae2ab3a191ff87b33d6f8048ca39aa8
Reviewed-on: https://go-review.googlesource.com/c/go/+/514898
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>

src/cmd/distpack/test.go

@@ -26,7 +26,7 @@ var srcRules = []testRule{
 	{name: "go/VERSION"},
 	{name: "go/src/cmd/go/main.go"},
 	{name: "go/src/bytes/bytes.go"},
-	{name: "go/.DS_Store", exclude: true},
+	{name: "**/.DS_Store", exclude: true},
 	{name: "go/.git", exclude: true},
 	{name: "go/.gitattributes", exclude: true},
 	{name: "go/.github", exclude: true},
@@ -44,7 +44,7 @@ var zipRules = []testRule{
 	{name: "go/src/cmd/go/main.go"},
 	{name: "go/src/bytes/bytes.go"},
 
-	{name: "go/.DS_Store", exclude: true},
+	{name: "**/.DS_Store", exclude: true},
 	{name: "go/.git", exclude: true},
 	{name: "go/.gitattributes", exclude: true},
 	{name: "go/.github", exclude: true},
@@ -73,7 +73,7 @@ var modRules = []testRule{
 	{name: "golang.org/toolchain@*/src/cmd/go/main.go"},
 	{name: "golang.org/toolchain@*/src/bytes/bytes.go"},
 
-	{name: "golang.org/toolchain@*/.DS_Store", exclude: true},
+	{name: "**/.DS_Store", exclude: true},
 	{name: "golang.org/toolchain@*/.git", exclude: true},
 	{name: "golang.org/toolchain@*/.gitattributes", exclude: true},
 	{name: "golang.org/toolchain@*/.github", exclude: true},