scripts/deps.sh: Use os-release(5) to select correct package manager

Fedora has apt packaged, which causes this script to do the wrong
thing if it is installed. Instead of checking for the package manager
binary, use os-release(5) data to select the correct package manager
to use.

scripts/deps.sh

@@ -8,8 +8,10 @@ function msg {
 
 trap 'msg "\x1B[31mFailed to install dependencies!"' ERR
 
-if which apt-get > /dev/null
-then
+source /etc/os-release
+
+
+if [[ "${ID}" =~ "debian" ]] || [[ "${ID_LIKE}" =~ "debian" ]]; then
   msg "Installing system build dependencies"
   sudo apt-get install \
     avr-libc \
@@ -36,7 +38,7 @@ then
     sdcc \
     uuid-dev \
     zlib1g-dev
-elif which dnf > /dev/null
+elif [[ "${ID}" =~ "fedora" ]] || [[ "${ID_LIKE}" =~ "fedora" ]]; then
 then
   msg "Installing system build dependencies"
   sudo dnf group install c-development