bootstrap: Add check for ext/stdio_filebuf.h needed by KWSys

bootstrap

@@ -511,6 +511,7 @@ cmake_kwsys_config_replace_string ()
                 s/@KWSYS_LFS_REQUESTED@/${KWSYS_LFS_REQUESTED}/g;
                 s/@KWSYS_NAME_IS_KWSYS@/${KWSYS_NAME_IS_KWSYS}/g;
                 s/@KWSYS_STL_HAS_WSTRING@/${KWSYS_STL_HAS_WSTRING}/g;
+                s/@KWSYS_CXX_HAS_EXT_STDIO_FILEBUF_H@/${KWSYS_CXX_HAS_EXT_STDIO_FILEBUF_H}/g;
                }" >> "${OUTFILE}${_tmp}"
     if [ -f "${OUTFILE}${_tmp}" ]; then
       if "${_diff}" "${OUTFILE}" "${OUTFILE}${_tmp}" > /dev/null 2> /dev/null ; then
@@ -1182,6 +1183,7 @@ KWSYS_BUILD_SHARED=0
 KWSYS_LFS_AVAILABLE=0
 KWSYS_LFS_REQUESTED=0
 KWSYS_STL_HAS_WSTRING=0
+KWSYS_CXX_HAS_EXT_STDIO_FILEBUF_H=0
 KWSYS_CXX_HAS_SETENV=0
 KWSYS_CXX_HAS_UNSETENV=0
 KWSYS_CXX_HAS_ENVIRON_IN_STDLIB_H=0
@@ -1224,6 +1226,15 @@ else
   echo "${cmake_cxx_compiler} does not have stl wstring"
 fi
 
+if cmake_try_run "${cmake_cxx_compiler}" \
+  "${cmake_cxx_flags} -DTEST_KWSYS_CXX_HAS_EXT_STDIO_FILEBUF_H" \
+  "${cmake_source_dir}/Source/kwsys/kwsysPlatformTestsCXX.cxx" >> cmake_bootstrap.log 2>&1; then
+  KWSYS_CXX_HAS_EXT_STDIO_FILEBUF_H=1
+  echo "${cmake_cxx_compiler} has <ext/stdio_filebuf.h>"
+else
+  echo "${cmake_cxx_compiler} does not have <ext/stdio_filebuf.h>"
+fi
+
 # Just to be safe, let us store compiler and flags to the header file
 
 cmake_bootstrap_version='$Revision$'