LoongArch: testsuite:Delete the default run behavior in pr60510.f.

When binutils does not support vector instruction sets, the test program fails
because it does not recognize vectorization at the assembly stage. Therefore,
the default run behavior of the program is deleted, so that the behavior of
the program depends on whether the software supports vectorization.

gcc/testsuite/ChangeLog:

	* gfortran.dg/vect/pr60510.f: Delete the default behavior of the
	program.

gcc/testsuite/gfortran.dg/vect/pr60510.f

-! { dg-do run }
 ! { dg-require-effective-target vect_double }
 ! { dg-require-effective-target vect_intdouble_cvt }
 ! { dg-additional-options "-fno-inline -ffast-math" }