.github: remove test-spec target

Has to many dependencies such as asciidoctor-pdf.

Signed-off-by: Richard Alpe <[email protected]>

Author: rical

.github/workflows/generic-x86-build.yml

@@ -53,10 +53,6 @@ jobs:
         run: |
           make legal-info
 
-      - name: Build test spec
-        run: |
-          make test-spec
-
       - name: Report Build Size
         run: |
           du -sh .