Fix for libical >= 4

Use webkit2gtk-4.1.

Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -86,7 +86,7 @@ fi
 AM_CONDITIONAL([HAVE_LIBARCHIVE], test "x$have_libarchive" = "xtrue")
 
 # Checks for libical
-PKG_CHECK_MODULES(LIBICAL, libical >= 1.0, have_libical=true,
+PKG_CHECK_MODULES(LIBICAL, libical >= 1.0 libicalss, have_libical=true,
     have_libical=false)
 if test "x$have_libical" = "xtrue"; then
     AC_DEFINE([HAVE_LIBICAL], [1], [Definded to 1 if compile with libical support])
@@ -132,7 +132,7 @@ if test "x$tasks" = "xyes"; then
 fi
 
 # Checks for libwebkit
-PKG_CHECK_MODULES(LIBWEBKIT, webkit2gtk-4.0 >= 2.8.0, have_libwebkit=true,
+PKG_CHECK_MODULES(LIBWEBKIT, webkit2gtk-4.1 >= 2.8.0, have_libwebkit=true,
     have_libwebkit=false)
 if test "x$have_libwebkit" = "xtrue"; then
     libwebkit="yes"
