Add some fixes to the configure script  for isInf and add
--enable-libcpp to projects/sample.

Patch by Dmitri Shubin with additional fixes by me.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153425 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/autoconf/m4/func_isinf.m4 b/autoconf/m4/func_isinf.m4
index c936bf9..5c000f8 100644
--- a/autoconf/m4/func_isinf.m4
+++ b/autoconf/m4/func_isinf.m4
@@ -19,7 +19,7 @@
 
 AC_SINGLE_CXX_CHECK([ac_cv_func_std_isinf_in_cmath],
                     [std::isinf], [<cmath>],
-                    [float f; std::isinf(f)}])
+                    [float f; std::isinf(f);])
 if test "$ac_cv_func_std_isinf_in_cmath" = "yes" ; then 
   AC_DEFINE([HAVE_STD_ISINF_IN_CMATH],1,[Set to 1 if the std::isinf function is found in <cmath>])
 fi