Re-add the autoconf rule for the docs/doxygen.cfg file.
For some reason this was not reverted when r103213 was.

At the same time, add an optional rule for clang's doxygen.cfg.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131279 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/configure b/configure
index f1f4dd3..20dc65e 100755
--- a/configure
+++ b/configure
@@ -22574,6 +22574,13 @@
 ac_config_files="$ac_config_files llvm.spec"
 
 
+ac_config_files="$ac_config_files docs/doxygen.cfg"
+
+if test -f ${srcdir}/tools/clang/README.txt; then
+  ac_config_files="$ac_config_files tools/clang/docs/doxygen.cfg"
+
+fi
+
 ac_config_files="$ac_config_files tools/llvmc/src/Base.td"
 
 
@@ -23194,6 +23201,8 @@
     "include/llvm/Support/DataTypes.h") CONFIG_HEADERS="$CONFIG_HEADERS include/llvm/Support/DataTypes.h" ;;
     "Makefile.config") CONFIG_FILES="$CONFIG_FILES Makefile.config" ;;
     "llvm.spec") CONFIG_FILES="$CONFIG_FILES llvm.spec" ;;
+    "docs/doxygen.cfg") CONFIG_FILES="$CONFIG_FILES docs/doxygen.cfg" ;;
+    "tools/clang/docs/doxygen.cfg") CONFIG_FILES="$CONFIG_FILES tools/clang/docs/doxygen.cfg" ;;
     "tools/llvmc/src/Base.td") CONFIG_FILES="$CONFIG_FILES tools/llvmc/src/Base.td" ;;
     "tools/llvm-config/llvm-config.in") CONFIG_FILES="$CONFIG_FILES tools/llvm-config/llvm-config.in" ;;
     "setup") CONFIG_COMMANDS="$CONFIG_COMMANDS setup" ;;