🛠️ Refactor: Transition hping3 to Autotools Build System

Summary

This PR modernizes the build system of hping3 by replacing the legacy hand-written configure + Makefile.in system with a robust GNU Autotools setup.

✅ Changes Overview

• 🔧 Replaced legacy build system:

  • Removed custom configure, Makefile.in, byteorder.c, systype.h, and related artifacts.
  • Deleted manual dependency generation and install logic.

• 🏗 Added Autotools integration:

  • Added configure.ac for autoconf with:
    • Static and shared libpcap support via --with-libpcap=PATH
    • Optional Tcl scripting via --enable-tcl + --with-libtcl=PATH
    • Endianness and OS detection
  • Added Makefile.am using Automake for source management and manpage install.
  • Created .gitignore for standard autotools artifacts (e.g., configure, Makefile.in, aclocal.m4, *.o, etc.)

• 💡 Removed obsolete files:

  • Removed byteorder.c (now handled via AC_C_BIGENDIAN)
  • Removed systype.h (now handled via configure.ac with AC_DEFINE)
  • Removed redundant manual build rules and scripts.

• 📦 Updated source includes:

  • Replaced byteorder.h and systype.h with config.h detection in source files (ars.h, hping2.h, etc.)
  • Replaced <net/bpf.h> includes with <pcap/bpf.h> for portability.

🔍 Build Instructions

autoreconf -i
./configure --with-libpcap=/path/to/libpcap [--enable-tcl --with-libtcl=/path/to/tcl]
make
sudo make install

🧪 Tested Environments

• Native Linux (Debian-based)
• Cross-compilation with uClibc (static)
• Build with and without --enable-tcl
• Static and dynamic linking of libpcap

🧹 Benefits

• Standards-compliant build flow (configure && make && make install)
• Easier cross-compilation support
• Clean dependency management
• Better portability across systems
• Supports both static and shared builds
• Optional Tcl scripting support