inc: add bindings to SoLoud audio library

Author: rversteegen

changelog.txt

@@ -67,6 +67,7 @@ Version 1.08.0
 - makefile: add arm and aarch64 targets to the bootstrap package
 - release: add arm and aarch64 targets as an option to the contrib/release.build.sh script
 - emscripten port (WIP, v1ctor & angros47)
+- bindings to SoLoud audio library (soloud_c.bi: C API only)
 
 [fixed]
 - makefile: under MSYS2 (and friends), TARGET_ARCH is now identified from shell's default target architecture instead of shell's host architecture