[lto][cmake] Fix the requires on the LTO library verification tests to be correct. =/.

rdar://24717107

Author: gottesmm

validation-test/LTO/host-libraries-do-have-bitcode.test-sh

@@ -10,7 +10,7 @@ set -e
 set -u
 
 # REQUIRES: lto
-# REQUIRES: macosx
+# REQUIRES: OS=macosx
 # RUN: %s %swift_obj_root %t
 
 function check_thin_archive_for_bitcode() {

validation-test/LTO/object-files-do-have-bitcode.test-sh

@@ -10,6 +10,7 @@ set -e
 set -u
 
 # REQUIRES: lto
+# REQUIRES: OS=macosx
 # RUN: %s %swift_obj_root
 
 if [[ -n "$(find $1/lib -iname '*.cpp.o' -type f -exec file {} \; | grep -v bit-code)" ]]; then

validation-test/LTO/target-libraries-do-not-have-bitcode.test-sh

@@ -7,6 +7,7 @@
 # are still mach-o files and come up as such.
 
 # REQUIRES: lto
+# REQUIRES: OS=macosx
 # RUN: %s %swift_obj_root %t
 
 set -u