[Darwin, X86, testsuite] Fix naked-1.c fail.

[Darwin, X86, testsuite] Fix naked-1.c fail.

This fails at m32 because the scan-asm is looking for an absence
of "ret". Darwin is generating the correct code for the function
but the picbase thunk has a 'ret' insn.  Fixed by making the test
use -mdynamic-no-pic for m32.

gcc/testsuite/ChangeLog:

2019-09-20  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.target/i386/naked-1.c: Alter options to use non-
	PIC codegen for m32 Darwin.

From-SVN: r276004