* gcc.target/i386/pr40906-3.c: Run only on *-*-linux* targets.

From-SVN: r150488

gcc/testsuite/gcc.target/i386/pr40906-3.c

-/* { dg-do run } */
+/* { dg-do run { target *-*-linux* } } */
 /* { dg-require-effective-target ilp32 } */
 /* { dg-options "-O2 -fomit-frame-pointer -msse2 -mpush-args -mno-accumulate-outgoing-args" } */