In 'gcc/gimple-ssa-sccopy.cc', '#define INCLUDE_ALGORITHM' instead of '#include ...

In 'gcc/gimple-ssa-sccopy.cc', '#define INCLUDE_ALGORITHM' instead of '#include <algorithm>'

... to avoid issues such as:

    In file included from [...]/lib/gcc/i686-pc-linux-gnu/5.2.0/include/xmmintrin.h:34:0,
                     from [...]/lib/gcc/i686-pc-linux-gnu/5.2.0/include/x86intrin.h:31,
                     from [...]/i686-pc-linux-gnu/include/c++/5.2.0/i686-pc-linux-gnu/64/bits/opt_random.h:33,
                     from [...]/i686-pc-linux-gnu/include/c++/5.2.0/random:50,
                     from [...]/i686-pc-linux-gnu/include/c++/5.2.0/bits/stl_algo.h:66,
                     from [...]/i686-pc-linux-gnu/include/c++/5.2.0/algorithm:62,
                     from [...]/source-gcc/gcc/gimple-ssa-sccopy.cc:32:
    [...]/lib/gcc/i686-pc-linux-gnu/5.2.0/include/mm_malloc.h:42:12: error: attempt to use poisoned "malloc"
         return malloc (size);
                ^
    make[2]: *** [Makefile:1197: gimple-ssa-sccopy.o] Error 1

Minor fix-up for commit cd794c3961017703a4d2ca0e854ea23b3d4b6373
"A new copy propagation and PHI elimination pass".

	gcc/
	* gimple-ssa-sccopy.cc: '#define INCLUDE_ALGORITHM' instead of
	'#include <algorithm>'.