Don't test panic=unwind in panic_main.rs on Fuchsia

Fuchsia compiles with panic=abort, so don't run the panic_main.rs test
with panic=unwind with it.

Author: erickt

tests/ui/panics/panic-main.rs

@@ -14,12 +14,15 @@
 
 //@[unwind-zero] compile-flags: -Cpanic=unwind
 //@[unwind-zero] exec-env:RUST_BACKTRACE=0
+//@[unwind-zero] ignore-fuchsia Backtrace not symbolized
 
 //@[unwind-one] compile-flags: -Cpanic=unwind
 //@[unwind-one] exec-env:RUST_BACKTRACE=1
+//@[unwind-one] ignore-fuchsia Backtrace not symbolized
 
 //@[unwind-full] compile-flags: -Cpanic=unwind
 //@[unwind-full] exec-env:RUST_BACKTRACE=full
+//@[unwind-full] ignore-fuchsia Backtrace not symbolized
 
 //@ run-fail
 //@ error-pattern:moop