libxml2: use Copyright in LIC_FILES_CHKSUM instead of COPYING

* COPYING is replaced by symlink to Copyright during do_configure
  (see configure.in), then we end with link to nonexistent file
* same issue as libxslt had http://patchwork.openembedded.org/patch/14195/

(From OE-Core rev: a9f495f8d001e25596189eaea0e1f96165ae9327)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/libxml/libxml2.inc

@@ -4,7 +4,7 @@ HOMEPAGE = "http://www.xmlsoft.org/"
 BUGTRACKER = "http://bugzilla.gnome.org/buglist.cgi?product=libxml2"
 SECTION = "libs"
 LICENSE = "MIT"
-LIC_FILES_CHKSUM = "file://COPYING;md5=bb90c48926316d9af6e2d70ca7013ade \
+LIC_FILES_CHKSUM = "file://Copyright;md5=bb90c48926316d9af6e2d70ca7013ade \
                     file://hash.c;beginline=6;endline=15;md5=ce702952bfddd7aee22639a2d6b54136 \
                     file://list.c;beginline=4;endline=13;md5=cdbfa3dee51c099edb04e39f762ee907 \
                     file://trio.c;beginline=5;endline=14;md5=6c025753c86d958722ec76e94cae932e"

meta/recipes-core/libxml/libxml2_2.7.8.bb

@@ -1,6 +1,6 @@
 require libxml2.inc
 
-PR = "r3"
+PR = "r4"
 
 SRC_URI[md5sum] = "8127a65e8c3b08856093099b52599c86"
 SRC_URI[sha256sum] = "cda23bc9ebd26474ca8f3d67e7d1c4a1f1e7106364b690d822e009fdc3c417ec"