pkg-infra: pass --disable-doc if documentation is not enabled

Many configure scripts support an option like --disable-doc, --disable-docs
or --disable-documentation.  Pass all of these to configure.

In addition, not all Xorg packages accept the --disable-xxx. Instead they
look for xmlto and/or fop and build documentation if they exist.  For host
packages, this may lead to build errors because /usr/bin/xmlto uses libxml2
and we set LD_LIBRARY_PATH to point to $(HOST_DIR)/lib, which may contain
a libxml2 as well.  So it's essential to disable xmlto for host packages.

Also some whitespace cleanup.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/Makefile.in

@@ -290,7 +290,15 @@ DISABLE_LARGEFILE= --disable-largefile
 endif
 
 ifneq ($(BR2_HAVE_DOCUMENTATION),y)
-DISABLE_DOCUMENTATION=--disable-gtk-doc
+# 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
 endif
 
 ifeq ($(BR2_INET_IPV6),y)

package/pkg-autotools.mk

@@ -116,6 +116,9 @@ endef
 else
 
 # Configure package for host
+# disable all kind of documentation generation in the process,
+# because it often relies on host tools which may or may not be
+# installed.
 define $(2)_CONFIGURE_CMDS
 	(cd $$($$(PKG)_SRCDIR) && rm -rf config.cache; \
 	        $$(HOST_CONFIGURE_OPTS) \
@@ -126,6 +129,12 @@ define $(2)_CONFIGURE_CMDS
 		--prefix="$$(HOST_DIR)/usr" \
 		--sysconfdir="$$(HOST_DIR)/etc" \
 		--enable-shared --disable-static \
+		--disable-gtk-doc \
+		--disable-doc \
+		--disable-docs \
+		--disable-documentation \
+		--with-xmlto=no \
+		--with-fop=no \
 		$$($$(PKG)_CONF_OPT) \
 	)
 endef