Update Cabal submodule to latest 1.22 snapshot

(cherry picked from commit d84742b0)

Update Cabal submodule to latest 1.22 snapshot
a1e2a2c8 · Herbert Valerio Riedel · 62a6d14b · 3a7f9015 · d920a43f · 3a7f9015
Commit a1e2a2c8 authored 10 years ago by Herbert Valerio Riedel
--- a/Cabal @ 3a7f9015
+++ b/Cabal @ 3a7f9015
-Subproject commit d920a43faba148ef63dff4d4a748ac5343380465
+Subproject commit 3a7f9015828745932a65d95fa985c98073fc7d95
--- a/testsuite/tests/driver/T4437.hs
+++ b/testsuite/tests/driver/T4437.hs
@@ -33,10 +33,6 @@ expectedGhcOnlyExtensions :: [String]
 expectedGhcOnlyExtensions = ["RelaxedLayout",
                             "AlternativeLayoutRule",
                             "AlternativeLayoutRuleTransitional",
-                             "DeriveAnyClass",
-                             "PatternSynonyms",
-                             "PartialTypeSignatures",
-                             "NamedWildCards",
                             "StaticPointers"]

 expectedCabalOnlyExtensions :: [String]