local.conf.sample.extended: add another warning to comment about GLIBC_GENERATE_LOCALES

(From meta-yocto rev: e8b5b952e4268ff1b87bacdd1c7db6a8d92fb321)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/local.conf.sample.extended

@@ -59,6 +59,11 @@
 # NOTE: If removing en_US.UTF-8 you will also need to uncomment, and set
 # appropriate value for IMAGE_LINGUAS.
 # WARNING: this may break localisation!
+# WARNING: some recipes expect certain localizations to be enabled, e.g.
+# bash-ptest: fr-fr, de-de
+# glib-2.0-ptest: tr-tr, lt-lt, ja-jp.euc-jp, fa-ir, ru-ru, de-de, hr-hr, el-gr, fr-fr, es-es, en-gb
+# if you remove some of these and enable ptest, you'll get QA warning like:
+# ERROR: glib-2.0-1_2.58.0-r0 do_package_qa: QA Issue: glib-2.0-ptest rdepends on locale-base-de-de, but it isn't a build dependency? [build-deps]
 #GLIBC_GENERATE_LOCALES = "en_GB.UTF-8 en_US.UTF-8"
 #IMAGE_LINGUAS ?= "en-gb"