PR libfortran/24903
	* m4/dotprodc.m4: Use __builtin_conj instead of assigning real
	and imaginary parts separately.
	* generated/dotprod_c4.c: Regenerated.
	* generated/dotprod_c8.c: Regenerated.
	* generated/dotprod_c10.c: Regenerated.
	* generated/dotprod_c16.c: Regenerated.

From-SVN: r111131