infra: Remove --disable-gtk-doc from packages, already defined in pkg-autotools.mk

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libglib2/libglib2.mk

@@ -62,7 +62,6 @@ LIBGLIB2_CONF_ENV += ac_cv_header_sys_inotify_h=no
 endif
 
 HOST_LIBGLIB2_CONF_OPTS = \
-		--disable-gtk-doc \
 		--disable-dtrace \
 		--disable-systemtap \
 		--disable-gcov \

package/network-manager/network-manager.mk

@@ -29,7 +29,6 @@ NETWORK_MANAGER_CONF_OPTS = \
 		--disable-qt \
 		--disable-more-warnings \
 		--without-docs \
-		--disable-gtk-doc \
 		--with-crypto=gnutls \
 		--with-iptables=/usr/sbin/iptables \
 		--disable-ifupdown \

package/systemd/systemd.mk

@@ -34,7 +34,6 @@ SYSTEMD_CONF_OPTS += \
 	--disable-selinux \
 	--disable-pam \
 	--disable-libcryptsetup \
-	--disable-gtk-doc \
 	--with-dbuspolicydir=/etc/dbus-1/system.d \
 	--with-dbussessionservicedir=/usr/share/dbus-1/services \
 	--with-dbussystemservicedir=/usr/share/dbus-1/system-services \