Disable no-stack-check test on Windows

Author: Keegan McAllister

src/test/run-make/no-stack-check/Makefile

@@ -1,9 +1,15 @@
 -include ../tools.mk
 
+ifndef IS_WINDOWS
 all:
 	$(RUSTC) -O --emit asm attr.rs
 	! grep -q morestack $(TMPDIR)/attr.s
 	$(RUSTC) -O --emit asm flag.rs
 	grep -q morestack $(TMPDIR)/flag.s
 	$(RUSTC) -O --emit asm -C no-stack-check flag.rs
 	! grep -q morestack $(TMPDIR)/flag.s
+else
+# On Windows we use __chkstk and it only appears in functions with large allocations,
+# so this test wouldn't be reliable.
+all:
+endif