We're no longer going to bother supporting platforms that don't
support C89.

We probably didn't support them anyways.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140361 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 811de5c..bdbb524 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -38,9 +38,8 @@
 AC_SUBST(LLVM_COPYRIGHT,["Copyright (c) 2003-2011 University of Illinois at Urbana-Champaign."])
 AC_COPYRIGHT([Copyright (c) 2003-2011 University of Illinois at Urbana-Champaign.])
 
-dnl Indicate that we require autoconf 2.59 or later. Ths is needed because we
-dnl use some autoconf macros only available in 2.59.
-AC_PREREQ(2.59)
+dnl Indicate that we require autoconf 2.60 or later.
+AC_PREREQ(2.60)
 
 dnl Verify that the source directory is valid. This makes sure that we are
 dnl configuring LLVM and not some other package (it validates --srcdir argument)
@@ -1215,7 +1214,6 @@
 AC_HEADER_DIRENT
 AC_HEADER_MMAP_ANONYMOUS
 AC_HEADER_STAT
-AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
 AC_HEADER_TIME