subversion-native: Enable subversion-native 1.7 and remove it from ASSUME_PROVIDED

This enables a switch to subversion 1.7 now bitbake is able to cope with
upgrading existing working copies. The impact of this change should be
minimal since we don't have many subversion recipes now.

(From OE-Core rev: ac0aa35ba6d7a21636bdd23d45ae0bf8112bdaa8)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/conf/bitbake.conf

@@ -157,7 +157,6 @@ ASSUME_PROVIDED = "\
     patch-native \
     perl-native-runtime \
     python-native-runtime \
-    subversion-native \
     tar-native \
     virtual/libintl-native \
     "

meta/recipes-devtools/subversion/subversion_1.7.2.bb

@@ -9,10 +9,6 @@ BBCLASSEXTEND = "native"
 
 PR = "r1"
 
-# negative, because of new checkout format in 1.7.0 
-# and distro PREMIRRORs need to be in sync with users
-DEFAULT_PREFERENCE = "-1"
-
 SRC_URI = "${APACHE_MIRROR}/${BPN}/${BPN}-${PV}.tar.bz2 \
            file://libtool2.patch \
 "