Add one-liner to Dockerfile that makes all devkitPPC executables the preferred ones

Dockerfile

@@ -32,6 +32,8 @@ RUN rm install-devkitpro-pacman
 RUN if [ ! -e /etc/mtab ]; then ln -s /proc/self/mounts /etc/mtab; fi
 ## and finally, we get to install devkitPPC
 RUN dkp-pacman -S devkitPPC --noconfirm
+## set devkitPPC executables as the default ones
+RUN for file in $(find "/opt/devkitpro/devkitPPC/bin" -type f -name 'powerpc-eabi*'); do original_file=$(basename "$file"); new_file=$(basename "$file" | sed 's/powerpc-eabi-//g'); update-alternatives --install "/usr/bin/$new_file" "$new_file" "/opt/devkitpro/devkitPPC/bin/$original_file" 0; done
 
 # --- stage ultralib headers ---
 RUN mkdir -p /N64_SDK/ultra/usr/