complex (pow(const complex<>&, int)): Do not define in C++0x mode, per DR 844.

2008-06-12  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/complex (pow(const complex<>&, int)): Do not define in
	C++0x mode, per DR 844.
	* include/tr1/complex (pow(const complex<>&, int)): Remove.
	* doc/xml/manual/intro.xml: Add an entry for DR 844.
	* testsuite/26_numerics/complex/dr844.cc: New.
	* testsuite/tr1/8_c_compatibility/complex/overloads_int.cc: Adjust.

From-SVN: r136694