Make the version checking for Apple LLVM a bit less strict.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15088 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.ac b/configure.ac
index 9de9217..a5aa964 100644
--- a/configure.ac
+++ b/configure.ac
@@ -154,7 +154,7 @@
 # Note: m4 arguments are quoted with [ and ] so square brackets in shell
 # statements have to be quoted.
 case "${is_clang}-${gcc_version}" in
-     applellvm-5.1|applellvm-6.0*)
+     applellvm-5.1|applellvm-6.*)
 	AC_MSG_RESULT([ok (Apple LLVM version ${gcc_version})])
 	;;
      icc-1[[3-9]].*)