ci: Enable fail-fast for faster CI feedback

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mhaynie

.github/workflows/ccpp.yml

@@ -14,7 +14,7 @@ jobs:
   build-linux:
     runs-on: ubuntu-latest
     strategy:
-      fail-fast: false
+      fail-fast: true
       matrix:
         MH_STUFF_COMPILE_LIBRARY: [true, false]
         compiler: