PATCH to fix libgomp OpenACC with C++11

[Jason Merrill]

noexcept () is a syntax error; I think you mean plain "noexcept" here.
In C++11 complex.h does not #define complex, so the testcase should use 
_Complex or __complex.

Tested x86_64-pc-linux-gnu, applying to trunk as obvious.
commit edb5a4d326b2e0ad7e4ed777d8f2917fd2f4eb2a
Author: Jason Merrill <ja...@redhat.com>
Date:   Fri May 8 16:09:58 2015 -0500

    	* openacc.h (__GOACC_NOTHROW): Fix noexcept syntax.
    
    	* testsuite/libgomp.oacc-c-c++-common/reduction-4.c (main): Use
    	_Complex.

diff --git a/libgomp/openacc.h b/libgomp/openacc.h
index 3343241..44a1526 100644
--- a/libgomp/openacc.h
+++ b/libgomp/openacc.h
@@ -39,7 +39,7 @@ extern "C" {
 #endif
 
 #if __cplusplus >= 201103
-# define __GOACC_NOTHROW noexcept ()
+# define __GOACC_NOTHROW noexcept
 #elif __cplusplus
 # define __GOACC_NOTHROW throw ()
 #else /* Not C++ */
diff --git a/libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-4.c b/libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-4.c
index d7da19e..eab2428 100644
--- a/libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-4.c
+++ b/libgomp/testsuite/libgomp.oacc-c-c++-common/reduction-4.c
@@ -14,7 +14,7 @@ main(void)
 {
   const int n = 1000;
   int i;
-  double complex vresult, result, array[n];
+  double _Complex vresult, result, array[n];
   bool lvresult, lresult;
 
   for (i = 0; i < n; i++)