fix: compilation and build for mac and amd architectures

[faraasat]

This fixes the build and compilation issues in Mac M1 onwards and for Arm Architecture as described in the issue #649 .

[Copilot]

Pull request overview

This PR addresses compilation and build failures on Mac M1+ and ARM architectures by conditionally compiling x86-specific code and compiler flags only when targeting x86_64 platforms.

Key Changes:

• Added architecture detection guards (CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|amd64") to conditionally include x86-specific compiler flags (-mrdrnd, -mavx, AVX-512) and test sources
• Updated intrinsics header to only include x86 intrinsic headers on x86 platforms
• Added build/ directory to .gitignore

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test/CMakeLists.txt	Conditionally includes x86-specific test sources (m256.cpp, network_messages.cpp) and -mrdrnd flag only for x86_64 builds
src/CMakeLists.txt	Splits Clang compiler options into x86-specific and generic branches, removing -mrdrnd and -target flags for non-x86 platforms
lib/platform_common/qintrin.h	Guards x86 intrinsic header inclusion with preprocessor checks for x86 architectures
cmake/CompilerSetup.cmake	Conditionally sets AVX/AVX-512 instruction flags and -mrdrnd test flag only for x86_64 architectures
.gitignore	Adds build directory to ignore list

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