Remove includes from .cabal-file

sol · hasufell · commit 4f7f16875c5e · 2024-06-27T00:14:19.000+08:00
This is useless at best, and a common source of confusion. haskell/cabal#10145 sol/hpack#355
diff --git a/unix.cabal b/unix.cabal
@@ -155,9 +155,6 @@ library
     ghc-options: -Wall
 
     include-dirs: include
-    includes:
-        HsUnix.h
-        execvpe.h
     install-includes:
         HsUnix.h
         execvpe.h
