cmake: Use bb.fatal() instead of raising FuncFailed

This sets a good example and avoids unnecessarily contributing to
perceived complexity and cargo culting.

Motivating quote below:

< kergoth> the *original* intent was for the function/task to error via
           whatever appropriate means, bb.fatal, whatever, and
           funcfailed was what you'd catch if you were calling
           exec_func/exec_task. that is, it's what those functions
           raise, not what metadata functions should be raising
< kergoth> it didn't end up being used that way
< kergoth> but there's really never a reason to raise it yourself

FuncFailed.__init__ takes a 'name' argument rather than a 'msg'
argument, which also shows that the original purpose got lost.

(From OE-Core rev: ff310dd103e16a5345a4bb48090af05f50171de3)

Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/cmake/cmake_3.6.1.bb

@@ -14,7 +14,7 @@ python () {
     docdir=d.getVar("docdir", True)
 
     if not docdir.startswith(prefix):
-        raise bb.build.FuncFailed('docdir must contain prefix as its prefix')
+        bb.fatal('docdir must contain prefix as its prefix')
 
     docdir_stripped = docdir[len(prefix):]
     if len(docdir_stripped) > 0 and docdir_stripped[0] == '/':