Remove build path from documentation's build path.

This not only breaks reproducible builds but also is useless, as the
build dir might change from submodule to submodule, and it might have a
random path on it.

debian/changelog

@@ -5,6 +5,9 @@ qt6-base (6.4.2+dfsg-15) UNRELEASED; urgency=medium
   [ Eren Eroğlu ]
   * Add qt6-base-doc* packages.
 
+  [ Lisandro Damián Nicanor Pérez Meyer ]
+  * Remove build path from documentation's index files.
+
  -- Lisandro Damián Nicanor Pérez Meyer <lisandro@debian.org>  Sat, 22 Jul 2023 11:55:09 -0300
 
 qt6-base (6.4.2+dfsg-14) unstable; urgency=medium

debian/rules

@@ -113,6 +113,9 @@ override_dh_auto_build-indep:
 
 override_dh_auto_install-indep:
 	DESTDIR=$(CURDIR)/debian/tmp dh_auto_build -- install_docs
+	# Remove build path from index files.
+	find $(CURDIR)/debian/tmp/usr/share/qt6/doc -type f -name *.index -exec \
+		sed -i 's@$(CURDIR)/@@g' {} \;
 
 override_dh_makeshlibs:
 	dh_makeshlibs -XlibQt6EglFSDeviceIntegration -XlibQt6EglFsKmsGbmSupport -XlibQt6EglFsKmsSupport -XlibQt6XcbQpa