profiles: qosify add explicit host dependency warning

If the host dependency is missing be explicit about the increasd build
time of more than an hour.

Signed-off-by: Paul Spooren <mail@aparcar.org>

profiles/qosify.yml

@@ -6,6 +6,10 @@ packages:
 host_dependecies:
   - name: llvm/clang-12
 
+    warning: >
+      Building llvm/clang, this will take 1hr+, please install clang/llvm-12+
+      on your system
+
     which:
       - clang-13
       - clang-12