Guard LC devtools by optional include

[white238]

I'm told this works:

include:
- path: /does/not/exist/or/not/accessible
  optional: True

It doesn't work exactly like what i wanted but we might be able to wrangle it...

I wanted something like this

cppcheck:
      version: [2.9]
      buildable: false
      allow_no_access: true
      externals:
      - spec: cppcheck@2.9
        prefix: /usr/workspace/smithdev/devtools/toss_4_x86_64_ib/latest/cppcheck-2.9