package/.mk files: remove --localstatedir=/var from autotools packages

Remove --localstatedir=/var from all autotools packages where it is no longer
needed.

Also remove --localstatedir=/var/lib/dhcp from package dhcp. localstatedir is
used by dhcp to set the default directory for the leases files. This can also
be done by setting --with-*-lease-file=/var/lib/dhcp/*, which is done in
dhcp.mk.

A custom --localstatedir is left in:
* proftpd.mk
* mysql.mk

This is safe to do:
One of the good thing with autoconf is that if you pass:
        --localstatedir=/var ... --localstatedir=/var/something
Then /var/something will be used. So, we can set --localstatedir=/var
by default in the infrastructure, and still have certain packages doing
weird things override it. [Thanks to Thomas Petazzoni]

Signed-off-by: Jörg Krause <jkrause@posteo.de>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/cups/cups.mk

@@ -17,8 +17,7 @@ CUPS_CONF_OPTS = --without-perl \
 		--without-php \
 		--disable-gnutls \
 		--disable-gssapi \
-		--libdir=/usr/lib \
-		--localstatedir=/var
+		--libdir=/usr/lib
 CUPS_CONFIG_SCRIPTS = cups-config
 
 CUPS_DEPENDENCIES = $(if $(BR2_PACKAGE_ZLIB),zlib) \