workflows: Tell CMake and Makefile.in to show compiler command-lines

This is usually desirable for batch processing: it lets us see exactly
what is happening in the logs.

Signed-off-by: Simon McVittie <smcv@collabora.com>

.github/workflows/emscripten.yml

@@ -13,4 +13,4 @@ jobs:
       - name: Configure CMake
         run: emcmake cmake -B build
       - name: Build
-        run: cmake --build build/
+        run: cmake -v --build build/