gst-plugins-*: add dependency on xz for head build

autopoint requires xz.

Closes Homebrew/homebrew#34173.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Formula/gst-plugins-bad.rb

@@ -18,6 +18,7 @@ class GstPluginsBad < Formula
     depends_on :autoconf
     depends_on :automake
     depends_on :libtool
+    depends_on 'xz' => :build
   end
 
   depends_on 'pkg-config' => :build

Formula/gst-plugins-base.rb

@@ -19,6 +19,7 @@ class GstPluginsBase < Formula
     depends_on :autoconf
     depends_on :automake
     depends_on :libtool
+    depends_on "xz" => :build
   end
 
   depends_on "pkg-config" => :build

Formula/gst-plugins-good.rb

@@ -24,6 +24,7 @@ class GstPluginsGood < Formula
     depends_on :automake
     depends_on :libtool
     depends_on 'check'
+    depends_on 'xz' => :build
   end
 
   depends_on 'pkg-config' => :build

Formula/gst-plugins-ugly.rb

@@ -18,6 +18,7 @@ class GstPluginsUgly < Formula
     depends_on :autoconf
     depends_on :automake
     depends_on :libtool
+    depends_on 'xz' => :build
   end
 
   depends_on 'pkg-config' => :build