fix: add compiler-libs.common to dune_ai_context library

Co-authored-by: aider (openai//workspace/models/openai-mirror/gpt-oss-120b/) <aider@aider.chat>

Author: zenfey

lib/dune

@@ -1,3 +1,3 @@
 (library
  (name dune_ai_context)
- (libraries str unix))
+ (libraries str unix compiler-libs.common))