Build Blackfin target with autoconf and cmake.

Note that configure was edited by hand. Will somebody with the correct version of autoconf please regenerate?

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77898 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/configure b/configure
index 304eaf1..e7ce56d 100755
--- a/configure
+++ b/configure
@@ -4935,7 +4935,7 @@
 fi
 
 case "$enableval" in
-  all) TARGETS_TO_BUILD="X86 Sparc PowerPC Alpha ARM Mips CellSPU PIC16 XCore MSP430 SystemZ CBackend MSIL CppBackend" ;;
+  all) TARGETS_TO_BUILD="X86 Sparc PowerPC Alpha ARM Mips CellSPU PIC16 XCore MSP430 SystemZ Blackfin CBackend MSIL CppBackend" ;;
   host-only)
     case "$llvm_cv_target_arch" in
       x86)     TARGETS_TO_BUILD="X86" ;;