package/gstreamer1/gst1-plugins-good: drop bogus BR2_PACKAGE_GST1_PLUGINS_GOOD_ZLIB

Commit 'dc7ca780a0 package/gstreamer1/gst1-plugins-good: convert package
type to meson' from 2019 removed the symbol, stating:
  Remove BR2_PACKAGE_GST1_PLUGINS_GOOD_ZLIB
  Existing configs will already have BR2_PACKAGE_ZLIB selected, so no
  legacy entry is needed for BR2_PACKAGE_GST1_PLUGINS_GOOD_ZLIB

So drop the reference to the symbol.

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit fa77b1b9f270d09f20ce5f9924dae27d91c7f883)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gstreamer1/gst1-plugins-good/gst1-plugins-good.mk

@@ -480,10 +480,6 @@ else
 GST1_PLUGINS_GOOD_CONF_OPTS += -Dwavpack=disabled
 endif
 
-ifeq ($(BR2_PACKAGE_GST1_PLUGINS_GOOD_ZLIB),y)
-GST1_PLUGINS_GOOD_DEPENDENCIES += zlib
-endif
-
 ifeq ($(BR2_PACKAGE_GST1_PLUGINS_GOOD_BZ2),y)
 GST1_PLUGINS_GOOD_CONF_OPTS += -Dbz2=enabled
 GST1_PLUGINS_GOOD_DEPENDENCIES += bzip2