infra: remove separate definition of DISABLE_DOCUMENTATION

Since we now always disable documentation on target, there is no need to
have a separate variable DISABLE_DOCUMENTATION anymore.

Suggested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/Makefile.in

@@ -332,16 +332,6 @@ ifneq ($(BR2_LARGEFILE),y)
 DISABLE_LARGEFILE= --disable-largefile
 endif
 
-# The configure option varies, but since unknown options are ignored
-# we can pass all of them.
-DISABLE_DOCUMENTATION = \
-	--disable-gtk-doc \
-	--disable-doc \
-	--disable-docs \
-	--disable-documentation \
-	--with-xmlto=no \
-	--with-fop=no
-
 ifeq ($(BR2_INET_IPV6),y)
 DISABLE_IPV6= --enable-ipv6
 else

package/pkg-autotools.mk

@@ -109,7 +109,12 @@ define $(2)_CONFIGURE_CMDS
 		--exec-prefix=/usr \
 		--sysconfdir=/etc \
 		--program-prefix="" \
-		$$(DISABLE_DOCUMENTATION) \
+		--disable-gtk-doc \
+		--disable-doc \
+		--disable-docs \
+		--disable-documentation \
+		--with-xmlto=no \
+		--with-fop=no
 		$$(DISABLE_NLS) \
 		$$(DISABLE_LARGEFILE) \
 		$$(DISABLE_IPV6) \