Remove a remaining reference to the obsolete C backend in configure

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154587 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/configure b/configure
index 8ff4e62..e87160d 100755
--- a/configure
+++ b/configure
@@ -1420,7 +1420,7 @@
   --enable-targets        Build specific host targets: all or
                           target1,target2,... Valid targets are: host, x86,
                           x86_64, sparc, powerpc, arm, mips, spu, hexagon,
-                          xcore, msp430, ptx, cbe, and cpp (default=all)
+                          xcore, msp430, ptx, and cpp (default=all)
   --enable-bindings       Build specific language bindings:
                           all,auto,none,{binding-name} (default=auto)
   --enable-libffi         Check for the presence of libffi (default is NO)