ghc: Correctly set 'haddock-interfaces'

Closes: #968446

p/ghc/debian/changelog

+ghc (8.8.4-2) UNRELEASED; urgency=medium
+
+  * Correctly set 'haddock-interfaces' for base libraries (Closes: #968446)
+
+ -- Ilias Tsitsimpis <iliastsi@debian.org>  Mon, 17 Aug 2020 08:55:33 +0300
+
 ghc (8.8.4-1) unstable; urgency=medium
 
   * New upstream release

p/ghc/debian/rules

@@ -196,7 +196,7 @@ override_dh_auto_install:
 	rm debian/tmp/var/lib/ghc/package.conf.d/package.cache
 	chmod +x debian/provided_substvars
 	debian/provided_substvars
-	sed -ri 's,^haddock-interfaces: /.*?/libraries/,haddock-interfaces: /usr/lib/ghc-doc/haddock/ghc/,' debian/tmp/var/lib/ghc/package.conf.d/*.conf
+	sed -ri 's,/usr/share/doc/ghc-doc/html/libraries/(.*)\.haddock,/usr/lib/ghc-doc/haddock/ghc/\1.haddock,' debian/tmp/var/lib/ghc/package.conf.d/*.conf
 
 	# Sort out the binaries
 	if inplace/bin/ghc-stage2 --info | grep '"Have interpreter","NO"'; then \