Remove unnecessary build flag.

build-mac.sh

@@ -2,7 +2,7 @@
 # build-mac.sh
 
 QT_BREW_PATH=$(brew --prefix qt@6)
-CMAKE_FLAGS="-DQT_DIR=${QT_BREW_PATH}/lib/cmake/Qt6 -DENABLE_NOGUI=false"
+CMAKE_FLAGS="-DQT_DIR=${QT_BREW_PATH}/lib/cmake/Qt6"
 
 # For some reason the system xxhash library doesn't get properly linked,
 # at least on my M1. The clang command gets -lxxhash, but probably needs
@@ -26,8 +26,8 @@ then
 fi
 
 # Move into the build directory, run CMake, and compile the project
-mkdir -p build
-pushd build
+BUILD_DIR=build
+mkdir -p $BUILD_DIR && pushd $BUILD_DIR
 cmake ${CMAKE_FLAGS} ..
 cmake --build . --target dolphin-emu -- -j$(sysctl -n hw.ncpu)
 popd