Added libbacktrace and recursive dependencies.

recipes/libbacktrace/recipe.py

@@ -0,0 +1,12 @@
+
+from SCons.Script import *
+
+def cook(env: Environment) -> dict:
+    repo = env.Cook('GitBranch', repo_name = 'libbacktrace', remote_url = 'https://github.com/ianlancetaylor/libbacktrace.git', git_ref = 'master')
+    checkout_root = repo['checkout_root']
+    build_result = env.Cook('AutotoolsProject', checkout_root)
+    return {
+        'LIBPATH': build_result['LIBPATH'],
+        'CPPPATH': build_result['CPPPATH'],
+        'LIBS': ['backtrace']
+    }