cairo: Update LICENSE field version to MPL-1 and LGPLv2.1

* Updated LICENSE field version from generic LGPL to MPL-1 and
  LGPLv2.1 to reflect the real license version.
* This change was based on setting in oe-core as well as code
  inspection.

Signed-off-by: Chase Maupin <Chase.Maupin@ti.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

recipes/cairo/cairo_1.10.0.bb

@@ -1,6 +1,8 @@
 require cairo.inc
 
-PR = "r2"
+LICENSE = "MPL-1 LGPLv2.1"
+
+PR = "r3"
 
 SRC_URI = "http://cairographics.org/releases/cairo-${PV}.tar.gz;name=cairo \
 "