license/insane: Show warning for obsolete license usage

We want to use SPDX identifiers in LICENSE variables. There is now a
conversion script to make most of the translations. Add a list of
strings which have been replaced so we can show warnings to users
if they're still used anywhere.

Add checks to the package as insane check. This is currently a warning
by default but can be turned off or made an error as per the other standard
checks.

(From OE-Core rev: 9379f80f484f94686a4d494e9e237fadfb72a938)

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

meta/classes/base.bbclass

@@ -597,6 +597,12 @@ python () {
 
             exceptions = (d.getVar("INCOMPATIBLE_LICENSE_EXCEPTIONS") or "").split()
 
+            for lic_exception in exceptions:
+                if ":" in lic_exception:
+                    lic_exception.split(":")[0]
+                if lic_exception in oe.license.obsolete_license_list():
+                    bb.fatal("Invalid license %s used in INCOMPATIBLE_LICENSE_EXCEPTIONS" % lic_exception)
+
             pkgs = d.getVar('PACKAGES').split()
             skipped_pkgs = {}
             unskipped_pkgs = []