build: set GLUON_DEPRECATED = 0 by default

We currently don't have any deprecated devices, so it doesn't make much
sense to force every site to specify this variable. Make it default to 0
instead.

Makefile

@@ -27,7 +27,7 @@ include $(GLUON_SITEDIR)/site.mk
 
 GLUON_RELEASE ?= $(error GLUON_RELEASE not set. GLUON_RELEASE can be set in site.mk or on the command line)
 
-GLUON_DEPRECATED ?= $(error GLUON_DEPRECATED not set. Please consult the documentation)
+GLUON_DEPRECATED ?= 0
 
 ifneq ($(GLUON_BRANCH),)
   $(warning *** Warning: GLUON_BRANCH has been deprecated, please set GLUON_AUTOUPDATER_BRANCH and GLUON_AUTOUPDATER_ENABLED instead.)

docs/multidomain-site-example/site.mk

@@ -58,6 +58,3 @@ GLUON_REGION ?= eu
 
 # Languages to include
 GLUON_LANGS ?= en de
-
-# Do not build images for deprecated devices
-GLUON_DEPRECATED ?= 0

docs/site-example/site.mk

@@ -55,6 +55,3 @@ GLUON_REGION ?= eu
 
 # Languages to include
 GLUON_LANGS ?= en de
-
-# Do not build images for deprecated devices
-GLUON_DEPRECATED ?= 0

docs/user/getting_started.rst

@@ -213,7 +213,7 @@ GLUON_DEPRECATED
   Usually, devices are deprecated because their flash size is insufficient to
   support future Gluon versions. The recommended setting is ``0`` for new sites,
   and ``upgrade`` for existing configurations (where upgrades for existing
-  deployments of low-flash devices are required).
+  deployments of low-flash devices are required). Defaults to ``0``.
 
 GLUON_LANGS
   Space-separated list of languages to include for the config mode/advanced settings. Defaults to ``en``.

docs/user/site.rst

@@ -562,7 +562,7 @@ GLUON_DEPRECATED
   Usually, devices are deprecated because their flash size is insufficient to
   support future Gluon versions. The recommended setting is ``0`` for new sites,
   and ``upgrade`` for existing configurations (where upgrades for existing
-  deployments of low-flash devices are required).
+  deployments of low-flash devices are required). Defaults to ``0``.
 
 GLUON_FEATURES
   Defines a list of features to include. Depending on the device, the feature list