Change all mentions of qt5 to qt@5 on macOS (melonDS-emu#937)

* Change all mentions of qt5 to qt@5 on macOS

* Use temporary workaround to get macOS brew updating

actions/runner-images#2322 (comment)

* Don't install CMake, it is already installed in the macOS runner

.github/workflows/build-macos.yml

@@ -21,7 +21,9 @@ jobs:
     - name: Install dependencies
       working-directory: ${{runner.workspace}}
       run: |
-        brew install cmake sdl2 qt5 libslirp libarchive
+        rm -rf /usr/local/bin/2to3 # Temporary workaround suggested here - https://github.com/actions/virtual-environments/issues/2322#issuecomment-749211076
+        brew update
+        brew install sdl2 qt@5 libslirp libarchive
     - name: Create build environment
       run: mkdir ${{runner.workspace}}/build
     - name: Configure

README.md

@@ -86,7 +86,7 @@ If everything went well, melonDS should now be in the `dist` folder.
 
 ### macOS:
 1. Install the [Homebrew Package Manager](https://brew.sh)
-2. Install dependencies: `brew install git pkg-config cmake sdl2 qt5 libslirp libarchive`
+2. Install dependencies: `brew install git pkg-config cmake sdl2 qt@5 libslirp libarchive`
 3. Compile:
    ```zsh
    git clone https://github.com/Arisotura/melonDS.git