CI mac arm64: disable cineform+Deltacast

- cineform seems to be unsupported altogether
- Deltacast should work but it doesn't seem so

.github/scripts/environment.sh

@@ -28,7 +28,6 @@ export FEATURES="\
  --enable-aja\
  --enable-blank\
  --enable-caca\
- --enable-cineform\
  --enable-decklink\
  --enable-file\
  --enable-gl\
@@ -81,4 +80,9 @@ case "$RUNNER_OS" in
                 return 1
                 ;;
 esac
+
+if [ "$(uname -s)" != Darwin ] || [ "$(uname -m)" != arm64 ]; then
+        FEATURES="$FEATURES --enable-cineform"
+fi
+
 printf '%b' "FEATURES=$FEATURES\n" >> "$GITHUB_ENV"

.github/scripts/install-common-deps.sh

@@ -15,7 +15,10 @@ if ! command -v nproc >/dev/null; then
         nproc() { sysctl -n hw.logicalcpu; } # mac
 fi
 
-is_arm() { expr "$(dpkg --print-architecture)" : arm >/dev/null; }
+is_arm() {
+        uname_m=$(uname -m)
+        expr "$uname_m" : arm > /dev/null || [ "$uname_m" = aarch64 ]
+}
 is_win() { [ "$win" = yes ]; }
 
 if is_win || [ "$(id -u)" -eq 0 ]; then

.github/scripts/macOS/install_others.sh

@@ -38,7 +38,7 @@ install_aja() {(
 
 install_deltacast() {(
         DELTA_CACHE_INST=${SDK_NONFREE_PATH-nonexistent}/VideoMasterHD_inst
-        if [ ! -d "$DELTA_CACHE_INST" ]; then
+        if [ ! -d "$DELTA_CACHE_INST" ] || [ "$(uname -m)" = arm64 ]; then
                 return 0
         fi
         FEATURES="$FEATURES --enable-deltacast"