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

.gitignore

@@ -11,7 +11,14 @@ toolchain/local/
 toolchain/build/
 toolchain/src/
 toolchain/sysroot/
+toolchain/sysroot-*/
 programs/bin/
+# Non-x86 userspace builds (programs/mk/arch.mk)
+programs/bin-*/
+programs/obj-*/
+programs/src/*/obj-*/
+programs/lib/*/obj-*/
+programs/lib/*/build-*/
 programs/obj/
 programs/src/*/obj/
 programs/libs/*/obj/