Added another way to compile using docker

[daiverd]

Add Docker-based Windows XP cross-compilation support

This PR introduces Docker-based cross-compilation capabilities for Windows XP compatibility, along with necessary build infrastructure and SAPI 4.0 headers.

Changes

Build System

• Add build-docker.sh script for Docker-based cross-compilation targeting Windows XP
• Compiled binaries are output to ./out directory
• Include build metadata files (buildnum.h, buildnum.rc)

SAPI 4.0 Integration

• Add SAPI 4.0 header files (speech.h, spchwrap.h, spchtel.h)
• These headers provide easier access to SAPI 4.0 functionality compared to extracting from existing SAPI4api files

Repository Configuration

• Configure .gitattributes to preserve CRLF line endings for header files
• Update .gitignore to exclude out/ build directory

I found this easier to get working than Visual Studio.

[TETYYS]

please write an original PR description or reduce it to a single sentence thats at the end