autoconf: restore old clang-srcdir behavior
authorDylan Noblesmith <nobled@dreamwidth.org>
Thu, 2 Feb 2012 00:17:33 +0000 (00:17 +0000)
committerDylan Noblesmith <nobled@dreamwidth.org>
Thu, 2 Feb 2012 00:17:33 +0000 (00:17 +0000)
commitdb6caea4f836ec0a635113a742b71705d6587dd4
tree17d047d2bbd18a7452c6b8e63914d2e04658bdd1
parent63c095199939bfa2711346a6394c5d9171b31f15
autoconf: restore old clang-srcdir behavior

Keep the string empty when unspecified. Undoes
part of r149563.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149568 91177308-0d34-0410-b5e6-96231b3b80d8
autoconf/configure.ac