Drop PRIORITY variable

As discussed on the mailing list, this variable isn't useful and if wanted
would be better implemented by distros using pn-X overrides.

This patch executes:

find . -regex ".*\.\(bb\|inc\)$" | xargs sed -i '/^PRIORITY = ".*"$/d'

against the tree removing the referenced. Thanks to Phil Blundell for
the command.

(From OE-Core rev: d122343362669c683acc4af295971a62cbc823fc)

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

meta/recipes-support/boost/boost-36.inc

@@ -7,7 +7,6 @@ DESCRIPTION = "Free peer-reviewed portable C++ source libraries"
 HOMEPAGE = "http://www.boost.org/"
 SECTION = "libs"
 DEPENDS = "boost-jam-native zlib"
-PRIORITY = "optional"
 LICENSE = "Boost"
 PR = "r4"
 

meta/recipes-support/boost/boost-jam-native.inc

@@ -6,7 +6,6 @@
 DESCRIPTION = "Make system for boost (native)"
 HOMEPAGE = "http://www.boost.org/"
 SECTION = "devel"
-PRIORITY = "optional"
 LICENSE = "Boost"
 PR = "r0"