pacman: only install not-installed deps (#1845)

Signed-off-by: Xeonacid <h.dwwwwww@gmail.com>

setup-dev.sh

@@ -125,7 +125,7 @@ Include = /etc/pacman.d/mirrorlist
 EOF
 
     sudo pacman -Syu --noconfirm || true
-    sudo pacman -S --noconfirm \
+    sudo pacman -S --needed --noconfirm \
         nasm \
         gcc \
         glibc-debug \

setup.sh

@@ -62,7 +62,7 @@ install_emerge() {
 
 install_pacman() {
     sudo pacman -Syy --noconfirm || true
-    sudo pacman -S --noconfirm git gdb python python-pip python-capstone python-unicorn python-pycparser python-psutil python-ptrace python-pyelftools python-six python-pygments which debuginfod
+    sudo pacman -S --needed --noconfirm git gdb python python-pip python-capstone python-unicorn python-pycparser python-psutil python-ptrace python-pyelftools python-six python-pygments which debuginfod
     if ! grep -q "^set debuginfod enabled on" ~/.gdbinit; then
         echo "set debuginfod enabled on" >> ~/.gdbinit
     fi