Work around wrong haddock-html path on Windows

See https://gitlab.haskell.org/ghc/ghc/-/issues/23476

haskell/private/pkgdb_to_bzl.py

@@ -134,6 +134,11 @@ def hs_library_pattern(name, mode = "static", profiling = False):
         # generate the database entry even if no haddock was generated.
         resolved_haddock_html = resolve(pkg.haddock_html, pkgroot)
 
+        if not os.path.exists(resolved_haddock_html):
+            # try to resolve relative to the package.conf.d dir
+            # see https://gitlab.haskell.org/ghc/ghc/-/issues/23476
+            resolved_haddock_html = resolve(pkg.haddock_html, package_conf_dir)
+
         if os.path.exists(resolved_haddock_html):
             haddock_html = path_to_label(pkg.haddock_html, pkgroot)
             if not haddock_html:
@@ -146,6 +151,11 @@ def hs_library_pattern(name, mode = "static", profiling = False):
     for interface_path in pkg.haddock_interfaces:
         resolved_path = resolve(interface_path, pkgroot).replace('\\', '/')
 
+        if not os.path.exists(resolved_path):
+            # try to resolve relative to the package.conf.d dir
+            # see https://gitlab.haskell.org/ghc/ghc/-/issues/23476
+            resolved_path = resolve(interface_path, package_conf_dir)
+
         # We check if the file exists because cabal will unconditionally
         # generate the database entry even if no haddock was generated.
         if not os.path.exists(resolved_path): continue