Add support for aarch64

[Alex Mihaiuc (foxmsft)]

This enables the aarch64 platform for ARM64 processors.

[Copilot]

Pull request overview

Adds aarch64 build, runtime, syscall, installation, and packaging support.

Changes:

• Adds architecture-aware CMake and cross-compilation support.
• Makes syscall mappings portable across x86_64 and aarch64.
• Updates installers, packages, dependencies, and build documentation.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
telemetryLoader.c	Safely handles architecture-specific syscall gaps.
sysinternalsEBPFshared.h	Adjusts integer-type inclusion for CO-RE.
sysinternalsEBPF.h	Derives the syscall limit from array size.
syscalls.h	Uses architecture-specific syscall constants.
package/DEBIAN.in/control.in	Adds dynamic architecture and dependency alternatives.
makePackages.sh	Produces architecture-specific DEB/RPM packages.
libsysinternalsEBPFinstaller.c	Selects the aarch64 library directory.
libsysinternalsEBPF.h	Expands and centralizes syscall limits.
installer.c	Uses the portable fcntl.h include.
ebpfKern/sysinternalsEBPF_common.h	Adds arm64 register layouts and syscall accessors.
CMakeLists.txt	Adds target detection and cross-build configuration.
cmake/aarch64-linux-gnu.cmake	Defines the aarch64 cross-compilation toolchain.
BUILD.md	Documents aarch64 cross-building and installation.
.container/install-ubuntu-dependencies.sh	Makes the i386 dependency architecture-specific.

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