feat: add support for aarch64 timer/interrupts, port MontaukOS userspace

scripts/install_apps.sh

@@ -9,7 +9,8 @@ SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
 
 SRC="$PROJECT_ROOT/programs/src"
-BIN="$PROJECT_ROOT/programs/bin"
+# PROGRAMS_BIN: the output tree, bin (x86_64) or bin-<arch>.
+BIN="$PROJECT_ROOT/programs/${PROGRAMS_BIN:-bin}"
 ICON_SRC="$PROJECT_ROOT/programs/gui/icons/Flat-Remix-Blue-Light-darkPanel"
 
 # App definitions: name|icon_source_path