ci: skip PCH on macOS, namespace issue; .o only

Author: pepc84

.github/workflows/build-cache.yml

@@ -95,9 +95,6 @@ jobs:
           BREW=$(brew --prefix)
           FLAGS="-std=c++2c -O2 -DPROCESSING_HAS_STB_IMAGE -DPROCESSING_HAS_STB_TRUETYPE -I src -I $BREW/include"
 
-          echo "Building Processing.h.gch..."
-          g++ $FLAGS -x c++-header src/Processing.h -o cache/macos-arm64/Processing.h.gch
-
           echo "Building Processing.o..."
           g++ $FLAGS -c src/Processing.cpp -o cache/macos-arm64/Processing.o
 
@@ -127,9 +124,6 @@ jobs:
           BREW=$(brew --prefix)
           FLAGS="-std=c++2c -O2 -target x86_64-apple-macos10.13 -DPROCESSING_HAS_STB_IMAGE -DPROCESSING_HAS_STB_TRUETYPE -I src -I $BREW/include"
 
-          echo "Building Processing.h.gch..."
-          g++ $FLAGS -x c++-header src/Processing.h -o cache/macos-x64/Processing.h.gch
-
           echo "Building Processing.o..."
           g++ $FLAGS -c src/Processing.cpp -o cache/macos-x64/Processing.o