adjust gitlab ci

.gitlab-ci.yml

-image: recolic/cxx-toolkit
+image: archlinux/base
 
 stages:
     - build
@@ -7,7 +7,7 @@ stages:
 build:
     stage: build
     script: 
-        - pacman -Sy && pacman -S --noconfirm bison flex gettext sdl2 lib32-glibc grep
+        - pacman -Sy && pacman -S --noconfirm gcc make bison flex gettext sdl2 lib32-glibc grep
         - export AM_HOME=$(pwd)/nexus-am/
         - cd nemu && make EXTRA_FLAGS='-DDISABLE_MMIO'
         - show_log=1 ./runall.sh &> testcases.log ; echo $? > testres.log